90 Minute Sleep Cycle Calculator

Free calculate optimal sleep and wake times based on 90-minute sleep cycles. Get instant, accurate results with our easy-to-use calculator.

Sleep Schedule

Average time it takes you to fall asleep

Optimal Wake Times

Enter your bedtime to see optimal wake times

About Sleep Cycles

  • • Each sleep cycle lasts approximately 90 minutes.
  • • Waking at the end of a cycle (light sleep) feels more natural.
  • • Most adults need 4-6 complete cycles (6-9 hours) of sleep.