Sleep Calculator
Calculate the best times to sleep and wake up based on sleep cycles. Wake up feeling refreshed by timing your alarm to complete full 90-minute cycles.
Each sleep cycle lasts about 90 minutes and includes light sleep, deep sleep, and REM stages.
Waking up between cycles (not during one) helps you feel more refreshed and alert.
Most adults need 5-6 complete cycles (7.5-9 hours) per night for optimal health.
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