Sleep Cycle Calculator
This ToolMorph Sleep Calculator helps determine the best time to go to sleep or wake up based on natural 90-minute sleep cycles.
How Sleep Cycles Work
Sleep occurs in repeating cycles lasting about 90 minutes. Each cycle contains light sleep, deep sleep and REM sleep. Completing full cycles improves recovery and alertness.
Recommended Sleep Duration
Most adults need between 7 and 9 hours of sleep, which equals about five to six sleep cycles.
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Frequently Asked Questions
How many sleep cycles should I get?
Most adults benefit from five or six sleep cycles each night.
How long is a sleep cycle?
A sleep cycle typically lasts around 90 minutes.