Sleep Cycle Calculator: Optimize Your Rest

Use our Sleep Cycle Calculator to find optimal sleep and wake times. Enter your desired wake-up time, and it will calculate the best bedtime based on 90-minute sleep cycles for better rest.


Calculate your optimal bedtime or wake-up time based on sleep cycles. Each cycle is approximately 90 minutes long.

Please select a time.
Your Sleep Schedule
Times are based on completing full 90-minute sleep cycles.
Understanding Sleep Cycles

A sleep cycle typically lasts about 90 minutes and consists of the following stages:

  • Light Sleep (N1)
  • Deeper Sleep (N2)
  • Deep Sleep (N3)
  • REM Sleep
Sleep Tips
  • Maintain a consistent sleep schedule
  • Avoid screens before bedtime
  • Keep your bedroom cool and dark
  • Limit caffeine intake in the evening