Sleep Calculator
Calculate optimal bedtime or wake time based on 90-minute sleep cycles for better rest quality.
Calculations include 15 minutes to fall asleep. Each sleep cycle is approximately 90 minutes.
How to Use This Sleep Calculator
- 1Choose mode: when to sleep or when to wake
- 2Enter your target time
- 3Click Calculate
- 4Choose from recommended times
Formula
Each sleep cycle = 90 minutes. Fall asleep time = 15 minutes. Optimal = 4-6 complete cycles.
Frequently Asked Questions
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About Sleep Calculator
Wake up feeling refreshed by aligning your sleep with natural 90-minute sleep cycles. This calculator accounts for the time it takes to fall asleep.