Sleep Cycle Calculator
Calculate the optimal times to sleep and wake up based on 90-minute sleep cycles.
Calculate Your Sleep
Choose how you want to calculate your optimal sleep times
Going to Sleep Now?
We'll calculate the best times for you to wake up
How It Works
Sleep occurs in cycles of approximately 90 minutes. Each cycle includes light sleep, deep sleep, and REM sleep phases. Waking up at the end of a complete cycle—during light sleep—helps you feel more refreshed.
Most adults need 4-6 complete sleep cycles (6-9 hours) per night. The calculator also accounts for approximately 15 minutes of time to fall asleep.
90
Minutes per cycle
5-6
Optimal cycles
15
Min to fall asleep