{"id":65873,"date":"2026-10-14T12:11:16","date_gmt":"2026-10-14T06:41:16","guid":{"rendered":"https:\/\/www.quickonlinetips.com\/archives\/?page_id=65873"},"modified":"2026-10-14T14:30:38","modified_gmt":"2026-10-14T09:00:38","slug":"sleep-calculator","status":"publish","type":"page","link":"https:\/\/www.quickonlinetips.com\/archives\/tools\/sleep-calculator\/","title":{"rendered":"Sleep Calculator: When to Wake Up or Go to Bed"},"content":{"rendered":"<p>This <strong>sleep calculator<\/strong> works out bedtimes and wake-up times that line up with your natural sleep cycles. Each cycle lasts about 90 minutes, and waking at the end of one, rather than in the middle of deep sleep, usually leaves you feeling more alert. Enter the time you need to get up, or the time you are going to bed.<\/p>\n<style>.qt-tool{--qt-accent:var(--global-palette1,#2B6CB0);--qt-accent2:var(--global-palette2,#215387);--qt-ink:var(--global-palette3,#1A202C);--qt-muted:var(--global-palette5,#4A5568);--qt-line:var(--global-palette7,#EDF2F7);--qt-soft:var(--global-palette8,#F7FAFC);--qt-bg:var(--global-palette9,#ffffff);background:#DCE7F3;border:1px solid #AEC3DB;border-radius:12px;padding:20px;margin:0 0 1.75em;color:var(--qt-ink);box-shadow:0 1px 2px rgba(26,32,44,.06)} .qt-tool *{box-sizing:border-box} .qt-tool .qt-label{display:block;font-weight:600;margin:0 0 6px} .qt-tool textarea,.qt-tool input[type=number],.qt-tool input[type=text],.qt-tool input[type=date],.qt-tool input[type=time],.qt-tool input[type=datetime-local],.qt-tool select{width:100%;font:inherit;font-size:16px;line-height:1.5;color:var(--qt-ink);background:var(--qt-bg);border:1px solid #CBD5E0;border-radius:8px;padding:10px 12px;margin:0} .qt-tool textarea{min-height:200px;resize:vertical;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:15px} .qt-tool textarea.qt-prose{font-family:inherit;font-size:16px} .qt-tool textarea:focus,.qt-tool input:focus,.qt-tool select:focus{outline:2px solid var(--qt-accent);outline-offset:1px;border-color:var(--qt-accent)} .qt-tool .qt-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:12px 0 0} .qt-tool .qt-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin:12px 0 0} .qt-tool .qt-field label{display:block;font-size:14px;font-weight:600;margin:0 0 4px;color:var(--qt-muted)} .qt-tool .qt-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;font:inherit;font-size:15px;font-weight:600;line-height:1.2;padding:10px 16px;border-radius:8px;border:1px solid var(--qt-accent);background:var(--qt-accent);color:#fff;cursor:pointer;text-decoration:none;min-height:42px} .qt-tool .qt-btn:hover{background:var(--qt-accent2);border-color:var(--qt-accent2);color:#fff} .qt-tool .qt-btn-ghost{background:var(--qt-bg);color:var(--qt-accent)} .qt-tool .qt-btn-ghost:hover{background:var(--qt-line);color:var(--qt-accent2)} .qt-tool .qt-btn-sm{font-size:14px;padding:6px 10px;min-height:34px} .qt-tool .qt-btn-big{font-size:17px;padding:12px 22px} .qt-tool .qt-check{display:flex;align-items:center;gap:8px;font-size:15px;margin:0;cursor:pointer} .qt-tool .qt-check input{width:18px;height:18px;margin:0;accent-color:var(--qt-accent)} .qt-tool .qt-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(118px,1fr));gap:8px;margin:12px 0 0} .qt-tool .qt-stat{background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:8px;padding:10px;text-align:center} .qt-tool .qt-num{display:block;font-size:24px;font-weight:700;line-height:1.2;color:var(--qt-accent2);font-variant-numeric:tabular-nums} .qt-tool .qt-lab{display:block;font-size:13px;color:var(--qt-muted);margin-top:2px} .qt-tool .qt-sub{font-weight:700;margin:16px 0 6px} .qt-tool .qt-note{font-size:13px;color:var(--qt-muted);margin:14px 0 0} .qt-tool .qt-status{min-height:1.4em;font-size:14px;color:var(--qt-accent2);margin:8px 0 0} .qt-tool .qt-error{color:#C53030} .qt-tool .qt-kw{margin:0;padding:0 0 0 1.4em;columns:2;column-gap:24px;font-size:15px} .qt-tool .qt-kw li{margin:0 0 4px;break-inside:avoid} .qt-tool .qt-kw span{color:var(--qt-muted)} .qt-tool .qt-result{background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:10px;padding:18px;margin:12px 0 0;text-align:center;font-size:44px;font-weight:700;line-height:1.25;color:var(--qt-accent2);word-break:break-word;font-variant-numeric:tabular-nums;min-height:94px} .qt-tool .qt-result.qt-many{font-size:22px;text-align:left;line-height:1.6;white-space:pre-wrap} .qt-tool .qt-history{margin:0;padding:0;list-style:none;font-size:14px;color:var(--qt-muted)} .qt-tool .qt-history li{padding:4px 0;border-bottom:1px dashed var(--qt-line);word-break:break-word} .qt-tool .qt-presets{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0 0} .qt-tool .qt-dice{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:14px 0 0;min-height:76px} .qt-tool .qt-die{width:68px;height:68px;border-radius:14px;background:var(--qt-bg);border:2px solid var(--qt-accent);display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700;color:var(--qt-ink);box-shadow:0 2px 0 var(--qt-accent2)} .qt-tool .qt-die.qt-pip{font-size:56px;font-weight:400;line-height:1} .qt-tool .qt-die-label{display:block;font-size:11px;font-weight:600;color:var(--qt-muted)} .qt-tool .qt-total{text-align:center;font-size:20px;margin:12px 0 0} .qt-tool .qt-total strong{font-size:32px;color:var(--qt-accent2)} .qt-tool .qt-roll{animation:qtroll .45s ease-out} @keyframes qtroll{0%{transform:rotate(-25deg) scale(.8)}60%{transform:rotate(12deg) scale(1.08)}100%{transform:rotate(0) scale(1)}} .qt-tool .qt-out{background:var(--qt-bg)} .qt-tool p:empty{display:none} .qt-tool p:not(.qt-note){margin:0} .qt-tool .qt-grid:has(.qt-check){grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:8px 16px} .qt-tool .qt-swatches{display:grid;grid-template-columns:repeat(6,1fr);gap:6px;margin:8px 0 18px} .qt-tool .qt-sw{font:inherit;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;font-weight:600;border:1px solid rgba(0,0,0,.12);border-radius:8px;min-height:64px;padding:6px 4px;cursor:pointer;display:flex;align-items:flex-end;justify-content:center;text-transform:uppercase;transition:transform .1s} .qt-tool .qt-sw:hover,.qt-tool .qt-sw:focus{transform:scale(1.06);outline:2px solid var(--qt-accent);outline-offset:1px} .qt-tool .qt-group{font-size:15px;font-weight:700;margin:14px 0 2px} .qt-tool .qt-seg{display:inline-flex;border:1px solid var(--qt-accent);border-radius:8px;overflow:hidden} .qt-tool .qt-seg button{font:inherit;font-size:14px;font-weight:600;padding:8px 14px;border:0;background:var(--qt-bg);color:var(--qt-accent);cursor:pointer} .qt-tool .qt-seg button[aria-pressed=true]{background:var(--qt-accent);color:#fff} .qt-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:14px;margin:0 0 1.75em} .qt-card{display:block;background:var(--global-palette8,#F7FAFC);border:1px solid #D5E0EC;border-radius:12px;padding:16px 18px;text-decoration:none;color:var(--global-palette3,#1A202C);transition:transform .12s,box-shadow .12s} .qt-card:hover{transform:translateY(-2px);box-shadow:0 4px 14px rgba(26,32,44,.10);color:var(--global-palette3,#1A202C)} .qt-card strong{display:block;font-size:18px;color:var(--global-palette1,#2B6CB0);margin:0 0 4px} .qt-card span{display:block;font-size:15px;color:var(--global-palette5,#4A5568);line-height:1.5} @media (max-width:600px){.qt-tool{padding:14px}.qt-tool .qt-swatches{grid-template-columns:repeat(3,1fr)}.qt-tool .qt-kw{columns:1}.qt-tool .qt-result{font-size:36px}.qt-tool .qt-die{width:58px;height:58px;font-size:24px}.qt-tool .qt-die.qt-pip{font-size:48px}} .qt-tool .qt-two{display:grid;grid-template-columns:1fr 1fr;gap:12px} .qt-tool .qt-two textarea{min-height:180px} .qt-tool .qt-diff{background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:8px;margin:12px 0 0;max-height:560px;overflow:auto;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13.5px;line-height:1.55} .qt-tool .qt-dl{display:grid;grid-template-columns:3.2em 3.2em 1.4em 1fr;min-width:0} .qt-tool .qt-ln{color:#A0AEC0;text-align:right;padding:0 6px;user-select:none;border-right:1px solid var(--qt-line)} .qt-tool .qt-sign{text-align:center;color:var(--qt-muted);user-select:none} .qt-tool .qt-code{white-space:pre-wrap;word-break:break-word;padding:0 8px 0 2px} .qt-tool .qt-add{background:#F0FFF4} .qt-tool .qt-add .qt-sign{color:#2F855A;font-weight:700} .qt-tool .qt-del{background:#FFF5F5} .qt-tool .qt-del .qt-sign{color:#C53030;font-weight:700} .qt-tool .qt-wadd{background:#9AE6B4;color:inherit;border-radius:2px;padding:0} .qt-tool .qt-wdel{background:#FEB2B2;color:inherit;border-radius:2px;padding:0;text-decoration:line-through} .qt-tool .qt-mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14px;word-break:break-all;background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:8px;padding:8px 10px;margin:4px 0 0;min-height:2.4em;color:var(--qt-ink)} .qt-tool .qt-big{font-size:18px;letter-spacing:.04em} .qt-tool .qt-explain{font-size:14px;color:var(--qt-muted);text-align:center;margin:6px 0 0;min-height:1.2em} .qt-tool .qt-result.qt-roman{font-size:32px} .qt-tool .qt-dateout{font-size:24px;font-weight:700;color:var(--qt-accent2);letter-spacing:.03em} .qt-ref{width:100%;border-collapse:collapse;font-size:15px;margin:0 0 1.5em} .qt-ref th,.qt-ref td{border:1px solid #E2E8F0;padding:6px 10px;text-align:left} .qt-ref th{background:#F7FAFC} @media (max-width:600px){.qt-tool .qt-two{grid-template-columns:1fr}.qt-tool .qt-dl{grid-template-columns:2.6em 2.6em 1.2em 1fr}} .qt-tool .qt-coinwrap{display:flex;justify-content:center;margin:8px 0 0;perspective:900px} .qt-tool .qt-coin{position:relative;width:150px;height:150px;cursor:pointer;transform-style:preserve-3d;border-radius:50%} .qt-tool .qt-coin:focus{outline:3px solid var(--qt-accent);outline-offset:4px} .qt-tool .qt-face{position:absolute;inset:0;border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;backface-visibility:hidden;-webkit-backface-visibility:hidden;background:radial-gradient(circle at 35% 30%,#FFF3B0,#F6C343 45%,#C9931E 100%);border:6px solid #B7791F;box-shadow:inset 0 0 0 4px rgba(255,255,255,.35),0 6px 14px rgba(0,0,0,.18);color:#744210;font-weight:800} .qt-tool .qt-face b{font-size:56px;line-height:1} .qt-tool .qt-face small{font-size:13px;letter-spacing:.12em;margin-top:2px} .qt-tool .qt-face-t{transform:rotateY(180deg);background:radial-gradient(circle at 35% 30%,#F7FAFC,#CBD5E0 45%,#8A99AD 100%);border-color:#718096;color:#2D3748} .qt-tool .qt-coin.qt-show-t{transform:rotateY(180deg)} .qt-tool .qt-coin.qt-flip-h{animation:qtfliph 1s cubic-bezier(.2,.7,.3,1) forwards} .qt-tool .qt-coin.qt-flip-t{animation:qtflipt 1s cubic-bezier(.2,.7,.3,1) forwards} @keyframes qtfliph{0%{transform:translateY(0) rotateY(0)}45%{transform:translateY(-40px) rotateY(900deg)}100%{transform:translateY(0) rotateY(1800deg)}} @keyframes qtflipt{0%{transform:translateY(0) rotateY(0)}45%{transform:translateY(-40px) rotateY(990deg)}100%{transform:translateY(0) rotateY(1980deg)}} .qt-tool .qt-small{font-size:15px;font-weight:400;color:var(--qt-muted);text-align:center;margin:6px 0 0;word-break:break-word} .qt-tool .qt-wheelbox{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);gap:16px;align-items:start} .qt-tool .qt-wheel{position:relative;width:100%;max-width:440px;margin:0 auto} .qt-tool .qt-wheel canvas{display:block;width:100%;height:auto;aspect-ratio:1\/1;cursor:pointer;border-radius:50%} .qt-tool .qt-wheel canvas:focus{outline:3px solid var(--qt-accent);outline-offset:3px} .qt-tool .qt-pointer{position:absolute;top:-6px;left:50%;transform:translateX(-50%);width:0;height:0;border-left:16px solid transparent;border-right:16px solid transparent;border-top:30px solid #1A202C;filter:drop-shadow(0 2px 1px rgba(0,0,0,.3));z-index:2} .qt-tool .qt-wheelbox textarea{min-height:240px} .qt-tool .qt-result.qt-pop{animation:qtpop .4s ease-out} @keyframes qtpop{0%{transform:scale(.8)}60%{transform:scale(1.06)}100%{transform:scale(1)}} .qt-tool .qt-btn[disabled]{opacity:.6;cursor:wait} .qt-tool .qt-lamp{width:46px;height:46px;border-radius:50%;background:#CBD5E0;border:3px solid #A0AEC0;flex:0 0 auto} .qt-tool .qt-lamp.qt-on{background:#F6E05E;border-color:#D69E2E;box-shadow:0 0 18px 6px rgba(246,224,94,.8)} .qt-tool .qt-result.qt-letters{font-size:72px} .qt-tool .qt-clock{font-size:56px;font-weight:700;text-align:center;font-variant-numeric:tabular-nums;color:var(--qt-ink);background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:10px;padding:14px;margin:12px 0 0;letter-spacing:.02em} .qt-tool .qt-clock.qt-done{color:#C53030;animation:qtpop .4s ease-out} .qt-tool .qt-tabs{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 12px} .qt-tool .qt-tabs button{font:inherit;font-size:15px;font-weight:600;padding:8px 14px;border-radius:8px;border:1px solid var(--qt-accent);background:var(--qt-bg);color:var(--qt-accent);cursor:pointer} .qt-tool .qt-tabs button[aria-selected=true]{background:var(--qt-accent);color:#fff} .qt-tool .qt-sent{font-size:17px;line-height:2.4} .qt-tool .qt-sent input{display:inline-block;width:7em;padding:6px 8px;margin:0 4px} .qt-tool .qt-ans{font-weight:700;color:var(--qt-accent2);font-size:20px;margin-left:6px} .qt-tool .qt-table{width:100%;border-collapse:collapse;font-size:14px;margin:12px 0 0;background:var(--qt-bg)} .qt-tool .qt-table th,.qt-tool .qt-table td{border:1px solid #D5E0EC;padding:6px 8px;text-align:left;word-break:break-all;vertical-align:top} .qt-tool .qt-table th{background:#F1F5FA;font-weight:700;word-break:normal} .qt-tool .qt-ok{color:#2F855A;font-weight:700} .qt-tool .qt-ip{font-size:38px;font-weight:700;text-align:center;color:var(--qt-accent2);word-break:break-all;background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:10px;padding:16px;margin:0} @media (prefers-reduced-motion:reduce){.qt-tool .qt-coin.qt-flip-h,.qt-tool .qt-coin.qt-flip-t{animation:none}.qt-tool .qt-coin.qt-flip-t{transform:rotateY(180deg)}} @media (max-width:700px){.qt-tool .qt-wheelbox{grid-template-columns:1fr}} @media (max-width:600px){.qt-tool .qt-clock{font-size:40px}.qt-tool .qt-ip{font-size:26px}} .qt-tool .qt-srow{display:flex;gap:10px;align-items:center;background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:8px;padding:8px 10px;margin:8px 0 0} .qt-tool .qt-sname{font-size:12px;color:var(--qt-muted);flex:0 0 120px} .qt-tool .qt-sval{flex:1 1 auto;font-size:20px;line-height:1.4;word-break:break-word;min-width:0} @media (max-width:600px){.qt-tool .qt-srow{flex-wrap:wrap}.qt-tool .qt-sname{flex-basis:100%}} .qt-tool .qt-meter{height:22px;background:#CBD5E0;border-radius:11px;overflow:hidden;margin:12px 0 0} .qt-tool .qt-meter span{display:block;height:100%;width:0;background:linear-gradient(90deg,#38A169 0,#38A169 60%,#D69E2E 80%,#C53030 100%);transition:width .06s linear} .qt-tool video,.qt-tool canvas.qt-snap{display:block;width:100%;max-height:420px;background:#1A202C;border-radius:10px;margin:12px 0 0;object-fit:contain} .qt-tool video.qt-mirror{transform:scaleX(-1)} .qt-tool .qt-kb{display:flex;flex-direction:column;gap:4px;margin:12px 0 0;padding:10px;background:#2D3748;border-radius:10px;outline:none;overflow-x:auto} .qt-tool .qt-kb:focus{box-shadow:0 0 0 3px var(--qt-accent)} .qt-tool .qt-krow{display:flex;gap:4px;min-width:640px} .qt-tool .qt-key{flex:1 1 0;height:36px;border-radius:5px;background:#4A5568;color:#E2E8F0;font-size:11px;font-weight:600;display:flex;align-items:center;justify-content:center;user-select:none;white-space:nowrap;overflow:hidden} .qt-tool .qt-key.qt-kok{background:#2F855A;color:#fff} .qt-tool .qt-key.qt-kon{background:#F6E05E;color:#1A202C} .qt-tool .qt-click{display:flex;align-items:center;justify-content:center;min-height:240px;margin:12px 0 0;border-radius:12px;background:var(--qt-accent);color:#fff;font-size:26px;font-weight:700;text-align:center;cursor:pointer;user-select:none;-webkit-user-select:none;touch-action:manipulation;padding:16px} .qt-tool .qt-click.qt-wait{background:#C53030} .qt-tool .qt-click.qt-go{background:#2F855A} .qt-tool .qt-click.qt-off{background:#718096;cursor:default} .qt-full{position:fixed;inset:0;z-index:999999;cursor:none} .qt-full-tip{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);z-index:1000000;background:rgba(0,0,0,.7);color:#fff;font:14px\/1.4 sans-serif;padding:8px 14px;border-radius:8px} .qt-tool .qt-gparow{grid-template-columns:minmax(0,2fr) minmax(0,1fr) minmax(0,1fr) minmax(0,1.2fr) auto;align-items:end} @media (max-width:600px){.qt-tool .qt-gparow{grid-template-columns:1fr 1fr;padding-bottom:10px;border-bottom:1px dashed var(--qt-line)}} .qt-tool .qt-hrrow{grid-template-columns:repeat(4,minmax(0,1fr));margin-top:6px} @media (max-width:600px){.qt-tool .qt-hrrow{grid-template-columns:repeat(2,minmax(0,1fr))}} .qt-tool .qt-tally{background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:10px;padding:12px;text-align:center} .qt-tool .qt-tally input{text-align:center;font-weight:600;border-color:transparent;background:transparent} .qt-tool .qt-tally .qt-tnum{font-size:56px;font-weight:700;line-height:1.1;color:var(--qt-accent2);font-variant-numeric:tabular-nums;cursor:pointer;user-select:none} .qt-tool .qt-tallies{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:10px;margin:12px 0 0} .qt-tool .qt-teams{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:10px;margin:12px 0 0} .qt-tool .qt-team{background:var(--qt-bg);border:1px solid var(--qt-line);border-top:4px solid var(--qt-accent);border-radius:10px;padding:10px 12px} .qt-tool .qt-team h3{font-size:16px;margin:0 0 6px} .qt-tool .qt-team ol{margin:0;padding-left:1.3em;font-size:15px} .qt-tool .qt-words{font-size:22px;line-height:1.75;height:5.6em;overflow:hidden;background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:10px;padding:8px 14px;margin:12px 0 0;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace} .qt-tool .qt-words span{padding:1px 3px;border-radius:4px} .qt-tool .qt-words .qt-cur{background:#FEFCBF} .qt-tool .qt-words .qt-wok{color:#2F855A} .qt-tool .qt-words .qt-wbad{color:#C53030;text-decoration:underline} .qt-tool .qt-words .qt-cur.qt-wtyping{background:#FED7D7} .qt-tool .qt-wlist{display:flex;flex-wrap:wrap;gap:6px;margin:6px 0 12px} .qt-tool .qt-wlist span{background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:6px;padding:3px 8px;font-size:15px;font-weight:600} .qt-tool .qt-wlist sub{font-size:10px;color:var(--qt-muted);margin-left:2px} .qt-tool h3.qt-wh{font-size:17px;margin:14px 0 2px} .qt-tool input[type=range]{width:100%;accent-color:var(--qt-accent)} .qt-tool .qt-pw{display:flex;gap:8px;align-items:center;background:var(--qt-bg);border:1px solid var(--qt-line);border-radius:8px;padding:8px 10px;margin:8px 0 0} .qt-tool .qt-pw code{flex:1 1 auto;font-size:17px;word-break:break-all;background:none;padding:0;min-width:0} .qt-tool .qt-strength{height:10px;border-radius:5px;background:#CBD5E0;overflow:hidden;margin:10px 0 0} .qt-tool .qt-strength span{display:block;height:100%;width:0;transition:width .2s} .qt-tool input[type=color]{width:100%;height:48px;padding:2px;border:1px solid #CBD5E0;border-radius:8px;background:var(--qt-bg);cursor:pointer} .qt-tool .qt-swatch{height:110px;border-radius:10px;border:1px solid rgba(0,0,0,.15);margin:12px 0 0;display:flex;align-items:center;justify-content:center;gap:24px;font-size:20px;font-weight:700} .qt-tool .qt-over{color:#C53030;font-weight:700} .qt-tool .qt-drop{border:2px dashed var(--qt-accent);border-radius:10px;padding:28px 12px;text-align:center;cursor:pointer;background:var(--qt-bg);margin:0 0 12px} .qt-tool .qt-drop.qt-hover{background:#E3EEFF} .qt-tool .qt-prev{display:block;max-width:100%;max-height:380px;margin:12px auto 0;border:1px solid var(--qt-line);border-radius:8px;background:repeating-conic-gradient(#E2E8F0 0 25%,#fff 0 50%) 0 0\/16px 16px} .qt-tool .qt-lb{display:inline-flex;width:44px;height:44px;border-radius:50%;align-items:center;justify-content:center;font-weight:700;font-size:17px;background:#fff;color:#1A202C;border:2px solid var(--qt-accent);margin:3px} .qt-tool .qt-lb.qt-bonus{background:#E53E3E;color:#fff;border-color:#E53E3E} .qt-tool .qt-8{width:230px;height:230px;border-radius:50%;margin:16px auto;background:radial-gradient(circle at 35% 30%,#666,#000 62%);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 10px 24px rgba(0,0,0,.35)} .qt-tool .qt-8 span{width:116px;height:116px;border-radius:50%;background:radial-gradient(circle,#2747a8,#0b1a4a);color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;font-size:13px;font-weight:700;padding:16px;box-sizing:border-box;line-height:1.25;transition:opacity .3s} .qt-tool .qt-shake{animation:qt-shake .7s} @keyframes qt-shake{0%,100%{transform:translate(0)}20%{transform:translate(-12px,4px) rotate(-6deg)}40%{transform:translate(10px,-6px) rotate(5deg)}60%{transform:translate(-8px,6px) rotate(-4deg)}80%{transform:translate(6px,-3px) rotate(3deg)}} .qt-tool .qt-grid>.qt-field{display:flex;flex-direction:column;justify-content:flex-end} .qt-tool .qt-field input[type=range]{height:46px;padding:0 10px} .qt-tool .qt-field input[type=color]{height:46px} .qt-tool .qt-drop .qt-sub{font-weight:400;font-size:14px;margin:4px 0 0} .qt-tool .qt-board{display:grid;gap:5px;margin:14px auto 0;max-width:100%;user-select:none;-webkit-user-select:none;touch-action:manipulation} .qt-tool .qt-cell{display:flex;align-items:center;justify-content:center;background:#fff;border:1px solid #AEC3DB;border-radius:6px;font-weight:700;cursor:pointer;aspect-ratio:1;font-size:clamp(14px,4vw,26px);color:#1A202C;padding:0;min-width:0;font-family:inherit;line-height:1} .qt-tool .qt-cell:disabled{cursor:default} .qt-tool .qt-win{background:#C6F6D5;border-color:#38A169} .qt-tool .qt-sel{background:#BEE3F8;border-color:#3182CE} .qt-tool .qt-bad{background:#FED7D7;border-color:#E53E3E} .qt-tool select{-webkit-appearance:none;-moz-appearance:none;appearance:none;padding-right:40px;cursor:pointer;border:2px solid #90B4DA;font-weight:600;background-color:#fff;background-image:url(\"data:image\/svg+xml,%3Csvg xmlns='http:\/\/www.w3.org\/2000\/svg' viewBox='0 0 14 9'%3E%3Cpath d='M1.5 1.5l5.5 5.5 5.5-5.5' fill='none' stroke='%232B6CB0' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'\/%3E%3C\/svg%3E\");background-repeat:no-repeat;background-position:right 14px center;background-size:14px 9px} .qt-tool select:hover{border-color:var(--qt-accent);background-color:#F4F8FD} .qt-tool select::-ms-expand{display:none} .qt-next{margin:0 0 1.75em} .qt-next .qt-next-h{font-size:14px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;color:#4A5568;margin:0 0 8px} .qt-next-g{display:grid;grid-template-columns:repeat(3,1fr);gap:8px} .qt-next-g a{display:flex;align-items:center;min-height:46px;padding:9px 12px;border:1px solid #AEC3DB;border-radius:8px;background:#F4F8FD;color:#215387;font-weight:600;font-size:15px;line-height:1.3;text-decoration:none} .qt-next-g a:hover,.qt-next-g a:focus{background:#E3EEFF;border-color:#2B6CB0;text-decoration:none} @media (max-width:600px){.qt-next-g{grid-template-columns:repeat(2,1fr)}}<\/style>\n<div class=\"qt-tool\" id=\"qt-sl\">\n<div class=\"qt-grid\">\n<div class=\"qt-field\"><label for=\"qt-sl-mode\">I want to<\/label><select id=\"qt-sl-mode\"><option value=\"wake\" selected>Wake up at<\/option><option value=\"bed\">Go to bed at<\/option><\/select><\/div>\n<div class=\"qt-field\"><label for=\"qt-sl-t\">Time<\/label><input type=\"time\" id=\"qt-sl-t\" value=\"07:00\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-sl-lat\">Minutes to fall asleep<\/label><input type=\"number\" id=\"qt-sl-lat\" value=\"15\" min=\"0\" max=\"120\"><\/div>\n<div class=\"qt-field\"><label for=\"qt-sl-cyc\">Cycle length (minutes)<\/label><input type=\"number\" id=\"qt-sl-cyc\" value=\"90\" min=\"60\" max=\"120\"><\/div>\n<\/div>\n<div class=\"qt-row\"><button type=\"button\" class=\"qt-btn\" id=\"qt-sl-now\">I&#8217;m going to bed now<\/button><\/div>\n<div class=\"qt-result qt-many\" id=\"qt-sl-head\" aria-live=\"polite\" style=\"min-height:0;font-size:20px\"><\/div>\n<table class=\"qt-table\">\n<thead>\n<tr>\n<th id=\"qt-sl-th\">Go to bed at<\/th>\n<th>Sleep cycles<\/th>\n<th>Hours asleep<\/th>\n<\/tr>\n<\/thead>\n<tbody id=\"qt-sl-out\"><\/tbody>\n<\/table>\n<div class=\"qt-status\" id=\"qt-sl-status\" aria-live=\"polite\"><\/div>\n<p class=\"qt-note\">Everything runs in your browser. Nothing you enter is sent to or stored on our server.<\/p>\n<\/div>\n<p><script>(function () { function qtReady(fn) { if (document.readyState === 'loading') { document.addEventListener('DOMContentLoaded', fn); } else { fn(); } } function qtCopy(text, statusEl, okMsg) { function done(ok) { if (statusEl) { statusEl.textContent = ok ? (okMsg || 'Copied to clipboard.') : 'Press Ctrl+C (or Cmd+C) to copy.'; } } function fallback() { var ta = document.createElement('textarea'); ta.value = text; ta.setAttribute('readonly', ''); ta.style.position = 'fixed'; ta.style.top = '-1000px'; document.body.appendChild(ta); ta.select(); var ok = false; try { ok = document.execCommand('copy'); } catch (e) { ok = false; } document.body.removeChild(ta); done(ok); } if (navigator.clipboard) { if (window.isSecureContext) { navigator.clipboard.writeText(text).then(function () { done(true); }, fallback); return; } } fallback(); } function qtRand32() { var c = window.crypto || window.msCrypto; if (c) { if (c.getRandomValues) { var a = new Uint32Array(1); c.getRandomValues(a); return a[0]; } } return Math.floor(Math.random() * 4294967296); } function qtRandInt(range) { if (range === 4294967296) { return qtRand32(); } var limit = Math.floor(4294967296 \/ range) * range; var x = qtRand32(); while (x >= limit) { x = qtRand32(); } return x % range; } qtReady(function () { var tEl = document.getElementById('qt-sl-t'); if (!tEl) { return; } function $(id) { return document.getElementById(id); } function pad(n) { return (n > 9 ? '' : '0') + n; } function fmt(min) { min = ((Math.round(min) % 1440) + 1440) % 1440; var h = Math.floor(min \/ 60), m = min % 60; return (h % 12 || 12) + ':' + pad(m) + ' ' + (h >= 12 ? 'PM' : 'AM'); } function upd() { var mode = $('qt-sl-mode').value, v = tEl.value.match(\/^(\\d\\d):(\\d\\d)\/); var lat = Math.max(0, parseFloat($('qt-sl-lat').value) || 0), cyc = parseFloat($('qt-sl-cyc').value) || 90; if (60 > cyc) { cyc = 60; } if (cyc > 120) { cyc = 120; } var body = $('qt-sl-out'); body.textContent = ''; if (!v) { return; } var base = +v[1] * 60 + +v[2]; $('qt-sl-th').textContent = mode === 'wake' ? 'Go to bed at' : 'Wake up at'; var ks = [6, 5, 4, 3]; if (mode === 'bed') { ks = [3, 4, 5, 6]; } var best = ''; ks.forEach(function (k) { var t = mode === 'wake' ? base - lat - k * cyc : base + lat + k * cyc; var tr = document.createElement('tr'); [fmt(t), String(k), (k * cyc \/ 60).toFixed(1).replace(\/\\.0$\/, '') + ' h'].forEach(function (x) { var td = document.createElement('td'); td.textContent = x; tr.appendChild(td); }); if (k >= 5) { tr.className = 'qt-ok'; if (!best) { best = fmt(t); } } body.appendChild(tr); }); $('qt-sl-head').textContent = mode === 'wake' ? 'To wake up at ' + fmt(base) + ', try to fall asleep by ' + fmt(base - 6 * cyc) + ' or ' + fmt(base - 5 * cyc) + '.' : 'Going to bed at ' + fmt(base) + '? Set your alarm for ' + fmt(base + lat + 5 * cyc) + ' or ' + fmt(base + lat + 6 * cyc) + '.'; $('qt-sl-status').textContent = 'Times include ' + lat + ' minutes to fall asleep. Green rows give 7.5 to 9 hours, the range most adults need.'; } ['qt-sl-t', 'qt-sl-lat', 'qt-sl-cyc'].forEach(function (id) { $(id).addEventListener('input', upd); }); $('qt-sl-mode').addEventListener('change', upd); $('qt-sl-now').addEventListener('click', function () { var n = new Date(); $('qt-sl-mode').value = 'bed'; tEl.value = pad(n.getHours()) + ':' + pad(n.getMinutes()); upd(); }); upd(); }); })();<\/script><\/p>\n<div class=\"qt-next\">\n<p class=\"qt-next-h\">Try another free tool<\/p>\n<div class=\"qt-next-g\"><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/time-zone-converter\/\">Time Zone Converter<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/countdown-to-date\/\">Countdown to a Date<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/week-number\/\">Week Number<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/day-of-the-week\/\">Day of the Week Calculator<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/pomodoro-timer\/\">Pomodoro Timer<\/a><a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\">Days Between Dates<\/a><\/div>\n<\/div>\n<p><strong>Quick answer:<\/strong> To wake up at 7:00 AM, aim to be asleep by 10:00 PM (six cycles, 9 hours) or 11:30 PM (five cycles, 7.5 hours). Go to bed about 15 minutes earlier to allow time to drift off.<\/p>\n<h2>How to use the sleep calculator<\/h2>\n<ol>\n<li>Choose <strong>Wake up at<\/strong> and enter your alarm time to see when to go to bed, or choose <strong>Go to bed at<\/strong> to see when to set your alarm.<\/li>\n<li>Click <strong>I&#8217;m going to bed now<\/strong> for wake-up times from this moment.<\/li>\n<li>Adjust the minutes it usually takes you to fall asleep. Most people need 10 to 20.<\/li>\n<li>If you know your own rhythm, change the cycle length. Cycles vary from about 80 to 110 minutes between people.<\/li>\n<\/ol>\n<h2>What are sleep cycles?<\/h2>\n<p>Through the night you move through repeating cycles of light sleep, deep sleep and REM (dreaming) sleep. Early cycles have more deep sleep; later ones have more REM. Waking during deep sleep is what causes that heavy, groggy feeling called sleep inertia. Timing your alarm for the end of a cycle, when sleep is lightest, can make mornings easier. The 90-minute figure is an average, so treat the times as a guide rather than an exact science.<\/p>\n<h2>How much sleep do you need?<\/h2>\n<table class=\"qt-ref\">\n<thead>\n<tr>\n<th>Age<\/th>\n<th>Recommended sleep per day<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Babies 4 to 12 months<\/td>\n<td>12 to 16 hours, including naps<\/td>\n<\/tr>\n<tr>\n<td>Toddlers 1 to 2 years<\/td>\n<td>11 to 14 hours, including naps<\/td>\n<\/tr>\n<tr>\n<td>Children 3 to 5 years<\/td>\n<td>10 to 13 hours, including naps<\/td>\n<\/tr>\n<tr>\n<td>Children 6 to 12 years<\/td>\n<td>9 to 12 hours<\/td>\n<\/tr>\n<tr>\n<td>Teens 13 to 18 years<\/td>\n<td>8 to 10 hours<\/td>\n<\/tr>\n<tr>\n<td>Adults 18 and over<\/td>\n<td>7 hours or more (7 to 9 is typical)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Source: American Academy of Sleep Medicine guidelines. Quality matters as much as hours.<\/p>\n<h2>Tips for better sleep<\/h2>\n<ul>\n<li>Keep the same bedtime and wake time every day, including weekends.<\/li>\n<li>Avoid caffeine in the 6 to 8 hours before bed and heavy meals late at night.<\/li>\n<li>Keep your bedroom cool, dark and quiet, and put screens away 30 to 60 minutes before sleep.<\/li>\n<li>Get daylight in the morning to set your body clock.<\/li>\n<\/ul>\n<p>If you often feel tired despite enough hours, snore loudly or wake gasping, talk to a doctor; these can be signs of a sleep disorder. Try a timed nap with the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/online-stopwatch\/\">countdown timer<\/a>, and plan focused work blocks with the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/pomodoro-timer\/\">Pomodoro timer<\/a>.<\/p>\n<h2>FAQ<\/h2>\n<h3>Is it better to sleep 6 or 7.5 hours?<\/h3>\n<p>Most adults need at least 7 hours. If you only have time for 6, waking at the end of a cycle may feel easier than 6.5 hours, but more sleep is still better over time.<\/p>\n<h3>How long is a power nap?<\/h3>\n<p>About 10 to 20 minutes, which keeps you in light sleep. A full 90-minute nap completes one cycle.<\/p>\n<h2>More free tools<\/h2>\n<div class=\"qt-cards\"><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/time-zone-converter\/\"><strong>Time Zone Converter<\/strong><span>Compare times across cities and plan meetings.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/countdown-to-date\/\"><strong>Countdown to a Date<\/strong><span>Live countdown to any date, event or holiday.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/week-number\/\"><strong>Week Number<\/strong><span>Today&#8217;s ISO week number and dates for any week.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/day-of-the-week\/\"><strong>Day of the Week Calculator<\/strong><span>Find the weekday for any date in history.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/pomodoro-timer\/\"><strong>Pomodoro Timer<\/strong><span>25-minute focus timer with breaks and alerts.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/days-between-dates\/\"><strong>Days Between Dates<\/strong><span>Count days, weeks and business days between two dates.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/age-calculator\/\"><strong>Age Calculator<\/strong><span>Your exact age in years, months and days, plus next birthday.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/percentage-calculator\/\"><strong>Percentage Calculator<\/strong><span>Work out X% of Y, percent change and more.<\/span><\/a><a class=\"qt-card\" href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/online-stopwatch\/\"><strong>Stopwatch and Timer<\/strong><span>Online stopwatch with laps and a countdown timer with alarm.<\/span><\/a><\/div>\n<p>See all of them on the <a href=\"https:\/\/www.quickonlinetips.com\/archives\/tools\/\">QuickOnlineTips free online tools<\/a> page and play our <a href=\"https:\/\/www.quickonlinetips.com\/archives\/games\/\">free online games<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>This sleep calculator works out bedtimes and wake-up times that line up with your natural sleep cycles. Each cycle lasts about 90 minutes, and waking at the end of one, rather than in the middle of deep sleep, usually leaves you feeling more alert. Enter the time you need to get up, or the time&#8230;<\/p>\n","protected":false},"author":4,"featured_media":0,"parent":65595,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"class_list":["post-65873","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65873","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/comments?post=65873"}],"version-history":[{"count":3,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65873\/revisions"}],"predecessor-version":[{"id":66442,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65873\/revisions\/66442"}],"up":[{"embeddable":true,"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/pages\/65595"}],"wp:attachment":[{"href":"https:\/\/www.quickonlinetips.com\/archives\/wp-json\/wp\/v2\/media?parent=65873"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}