Sleep Calculator - Bedtime
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About this app
Sleep Calculator uses the idea that sleep runs in ~90-minute cycles (light → deep → REM) to find "refreshing" bed and wake times — timed so you wake at the end of a cycle, in light sleep, rather than mid-deep-sleep. See at a glance what time to wake if you sleep now, or what time to go to bed to hit a target wake-up.
■ Bed & wake calculation
· Sleep now? — enter your bedtime (or "now") to get recommended wake times at cycle ends.
· Wake by a set time? — enter your target wake time to get recommended bedtimes, worked backwards.
· "Today/tomorrow" labels with time remaining.
· Accounts for the time it takes you to fall asleep, so it calculates from when you actually doze off.
· Sleep cycle preview — a hypnogram visualizing the depth of the selected night.
■ Nap mode
· Wake times tuned for 10/20/30/60/90-minute power naps.
· One-tap alarm via your device's clock app.
■ Log & sleep debt
· Record a night by bed/wake times (with sleep quality and a note).
· Edit past entries, pick any date, period filters (7/14/30 days), search by note or date.
· Sleep debt dashboard — sleep below your goal over the last 7 days, average sleep, and goal streak.
· Last 14 nights bar chart (with a goal line).
■ Stats
· Bedtime regularity score, average sleep by weekday, average bed/wake times.
· Quality trend and a 10-week calendar heatmap to spot your pattern.
■ Reminders & extras
· Bedtime reminder — a local notification at the time you choose.
· Turn recommended bed/wake times into a shareable image card.
· Backup & restore your data (on-device file).
· First-run onboarding and a "tip of the day" in the Guide.
■ Guide
· Plain-language notes on sleep cycles, waking at a cycle's end, sleep debt, recommended sleep by age, and sleep hygiene.
■ Privacy & storage
· All records and settings stay only on your device (never uploaded).
· No account or login; works offline.
· Korean/English, light & dark themes.
Note: Ads include a bottom banner and rewarded ads. Watching a rewarded ad you choose can optionally unlock: remove the banner for 24h, detailed stats, theme skins, backup & restore, share skins, and premium presets.
Note: The recommended times and sleep debt are reference estimates from a general sleep-cycle model, not medical advice. Actual sleep varies by person and condition; if problems persist, consult a professional.
■ Bed & wake calculation
· Sleep now? — enter your bedtime (or "now") to get recommended wake times at cycle ends.
· Wake by a set time? — enter your target wake time to get recommended bedtimes, worked backwards.
· "Today/tomorrow" labels with time remaining.
· Accounts for the time it takes you to fall asleep, so it calculates from when you actually doze off.
· Sleep cycle preview — a hypnogram visualizing the depth of the selected night.
■ Nap mode
· Wake times tuned for 10/20/30/60/90-minute power naps.
· One-tap alarm via your device's clock app.
■ Log & sleep debt
· Record a night by bed/wake times (with sleep quality and a note).
· Edit past entries, pick any date, period filters (7/14/30 days), search by note or date.
· Sleep debt dashboard — sleep below your goal over the last 7 days, average sleep, and goal streak.
· Last 14 nights bar chart (with a goal line).
■ Stats
· Bedtime regularity score, average sleep by weekday, average bed/wake times.
· Quality trend and a 10-week calendar heatmap to spot your pattern.
■ Reminders & extras
· Bedtime reminder — a local notification at the time you choose.
· Turn recommended bed/wake times into a shareable image card.
· Backup & restore your data (on-device file).
· First-run onboarding and a "tip of the day" in the Guide.
■ Guide
· Plain-language notes on sleep cycles, waking at a cycle's end, sleep debt, recommended sleep by age, and sleep hygiene.
■ Privacy & storage
· All records and settings stay only on your device (never uploaded).
· No account or login; works offline.
· Korean/English, light & dark themes.
Note: Ads include a bottom banner and rewarded ads. Watching a rewarded ad you choose can optionally unlock: remove the banner for 24h, detailed stats, theme skins, backup & restore, share skins, and premium presets.
Note: The recommended times and sleep debt are reference estimates from a general sleep-cycle model, not medical advice. Actual sleep varies by person and condition; if problems persist, consult a professional.
Find refreshing bed & wake times by sleep cycle, plus naps, debt & a sleep log.
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
What’s new
Sleep Calculator 1.1.0
· Nap mode — wake times for 10/20/30/60/90-min naps
· Save a result to your log; one-tap alarm via your clock app
· Shareable card for recommended times
· Log editing, any-date entry, filters (7/14/30 days), search
· New Stats tab — regularity score, weekday averages, 10-week heatmap
· Bedtime reminder notification
· Backup & restore, theme skins
· Rewarded ads optionally remove the banner for 24h and more
All records stay only on your device.
· Nap mode — wake times for 10/20/30/60/90-min naps
· Save a result to your log; one-tap alarm via your clock app
· Shareable card for recommended times
· Log editing, any-date entry, filters (7/14/30 days), search
· New Stats tab — regularity score, weekday averages, 10-week heatmap
· Bedtime reminder notification
· Backup & restore, theme skins
· Rewarded ads optionally remove the banner for 24h and more
All records stay only on your device.
