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Sleep Cycle Calculator
Calculate optimal bedtime or wake time based on 90-minute sleep cycles to wake up feeling refreshed and energized at the end of your natural sleep rhythm.
Calculate Sleep Times
Select the time you need to wake up
Sleep Stages in Each Cycle
Stage 1 (5 min):Light sleep, easy to wake
Stage 2 (45 min):Deeper sleep, body temperature drops
Stage 3 (20 min):Deep sleep, physical restoration
REM (20 min):Dream sleep, mental restoration
Sleep Disclaimer
Sleep cycle calculations are based on average sleep patterns and may not work for everyone. Individual sleep needs vary based on age, lifestyle, and health conditions. If you have persistent sleep issues, consult a healthcare professional or sleep specialist.