Sleep Cycle Calculator
Find the best time to wake up or go to sleep based on 90-minute sleep cycles to wake up refreshed
09:46 PM
11:16 PM
12:46 AM
02:16 AM
03:46 AM
05:16 AM
A full sleep cycle lasts about 90 minutes and includes light sleep, deep sleep, and REM stages. Waking up at the end of a cycle (instead of mid-cycle) helps you feel more refreshed. Most adults need 4–6 complete cycles per night.
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