Sleep Calculator
Calculate optimal bedtimes or wake times based on 90-minute sleep cycles. Wake up feeling refreshed.
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About Sleep Cycles
Sleep occurs in ~90-minute cycles, moving through light sleep, deep sleep, and REM stages. Waking at the end of a cycle (rather than mid-cycle) helps you feel more alert.
Note: Individual sleep cycles vary (80-120 minutes). Use these times as guidelines and adjust based on how you feel.