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Sleep Calculator
Plan your bedtime or wake-up time around complete sleep cycles and give yourself time to fall asleep.
Suggested Bedtimes
Sleep cycles vary, so think of these as useful planning targets rather than exact biological deadlines.
💤 How this works: Sleep is often described in cycles averaging about 90 minutes, although actual cycle length varies throughout the night and from person to person. This calculator uses 90 minutes as a simple planning estimate.
This calculator is for general informational purposes and is not medical advice. Sleep needs vary by age and individual circumstances.