Sleep Calculator

Find your perfect bedtime

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About Sleep Calculator

A science-based sleep calculator that uses 90-minute sleep cycle theory to find the optimal time to fall asleep or wake up. Choose your desired wake-up time and see recommended bedtimes that align with complete sleep cycles — helping you wake during light sleep phases rather than deep sleep. Includes age-specific sleep duration recommendations from the National Sleep Foundation, a sleep debt calculator, and personalized tips for improving sleep quality. 100% client-side.

Sleep Calculator Features

  • Sleep cycle alignment
  • Bedtime & wake-up modes
  • Age recommendations
  • Sleep debt tracker
  • Nap calculator
  • Fall-asleep offset
  • Sleep quality tips

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