Sleep Calculator
Find the best time to wake up based on sleep cycles
It takes ~15 minutes to fall asleep. Aim to wake up at the end of a 90-minute sleep cycle.
Sleep Cycle Calculator
A full sleep cycle lasts about 90 minutes. Waking up at the end of a cycle (rather than in the middle) leaves you feeling refreshed because you are not interrupting deep REM sleep.
Most adults need 5-6 complete cycles per night, which is 7.5-9 hours of sleep.