Last night
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No nights recorded
Sleep Ledger
Your sleep, day by day
7-day average
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0 nights recorded
30-day average
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0 nights recorded
Goal streak
0 nights
Build your rhythm
READY FOR TONIGHT
Sleep session
Tap when you go to sleep. Tap again when you wake up.
Sleep cycle calculator
Estimated bedtimes for your saved wake time.
Right now—
Target wake time—
Loading your saved wake time…
If you’re tired now, don’t stay awake just to reach a calculated time. These estimates don’t replace your sleep goal.
About these estimates
Each option works back from your next target wake time using a 90-minute cycle estimate, then subtracts your time to fall asleep. Times already passed are left out. Your target wake time and sleep goal come from your existing Settings.
Real sleep cycles vary; NIH describes cycles of about 80–100 minutes. This app cannot detect sleep stages or predict the easiest moment to wake. Getting enough sleep still matters, even when you feel less groggy after a shorter night.
The calculator is a planning tool. It does not set an alarm or start a sleep session. Use your usual two buttons to record your night.
Sleep Duration
0 nights recorded this year
Your goal: 8h · perfect 8–10h
Sleep Quality
Based on your bedtime and wake time.
Your schedule: 11 pm – 7 am
This chart measures timing against your personal schedule. It cannot measure sleep stages, interruptions, or how rested you feel.
Your sleep patterns
More insights from the same two taps.
Typical bedtime
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Past 7 days
Typical wake time
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Past 7 days
Timing variation
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Log at least 2 nights
Goal shortfall
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Past 7 days · recorded nights only
Nights on goal
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Past 30 days
Weekend shift
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Log 2 weekday and 2 weekend nights
How these numbers work
Typical times average your clock times over the past 7 days, including times around midnight. Timing variation is the average difference from those typical bedtimes and wake times; lower means more consistent.
Goal shortfall adds the hours below your chosen goal on recorded days. Extra hours on another day do not subtract from it. Nights on goal uses your full perfect range over the past 30 days.
Weekend shift compares the middle of your sleep on Saturday/Sunday wake dates with weekday wake dates over the past 30 days. Timing statistics use each day’s longest session and its recorded time zone. Missing days are left out.
The focus on regular timing follows NIH sleep guidance. CDC explains sleep duration and quality. These are summaries of your logs; goal shortfall is not a measure of medical sleep debt.
Recent nights
Bedtime, wake time, and the hours between.
A fresh start
Your first night will appear here.