Health

Sleep Cycle Calculator

Find the best bedtime or wake-up time based on 90-minute sleep cycles.

Time to fall asleep (~15 min) is included.

Suggested bedtimes

9:45 PMBest

6 cycles · 9 hours

11:15 PMBest

5 cycles · 7.5 hours

12:45 AMGood

4 cycles · 6 hours

2:15 AMsleepCalculator.ok

3 cycles · 4.5 hours

Each sleep cycle is approximately 90 minutes. Waking at the end of a cycle helps you feel more rested.

All calculations run locally in your browser.

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