Calculator Pro

Sleep Calculator

Calculate ideal bedtimes and wake-up times based on sleep cycles.

Sleep Calculator

Sleep Calculator

Sleep Cycles

Human sleep occurs in cycles of approximately 90 minutes. Waking up at the end of a sleep cycle often results in feeling more refreshed.

How it works

  • Fall asleep: ~15 minutes (average).
  • Cycle: ~90 minutes.
  • Ideal Sleep: 5-6 cycles (7.5 - 9 hours).