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Sleep Calculator
Find suggested bedtimes or wake-up times based on estimated 90-minute sleep cycles.
How this sleep calculator works
This calculator uses an estimated 90-minute sleep-cycle length and your selected time to fall asleep to suggest possible sleep and wake times.
Sleep cycles vary from person to person and from night to night, so these times are estimates rather than exact targets.
Note: This calculator is for general informational purposes only and is not medical advice.