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Sleep Calculator

Find the best bedtime or wake-up time based on 90-minute sleep cycles. Waking between cycles means you feel refreshed instead of groggy. Includes age-based sleep recommendations.

Sleep CyclesInstant
😴 Calculator
Calculator adds ~15 minutes to fall asleep
📊 Optimal Times
Best times to wake up if sleeping now
Each option completes full 90-min sleep cycles
Bedtimes (to wake at your chosen time)
Recommended Sleep for Your Age
Age GroupRecommendedMax Cycles

FAQs — Sleep Calculator