😴 Sleep Calculator
Estimated bedtime and wake-up ranges based on 80–100 minute sleep cycles and an adjustable sleep-onset period.
Wake Up Time
Bedtime
Enter the approximate number of minutes it usually takes you to fall asleep.
Estimated bedtime range:
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Estimated bedtime ranges:
💡 How These Estimates Work
- Sleep cycles do not always last exactly the same amount of time. This calculator uses an estimated range of 80–100 minutes per cycle.
- Cycle length can vary between individuals and may also change during different parts of the same night.
- The sleep-onset period is added separately and can be changed to match the approximate time normally needed to fall asleep.
- The displayed results are approximate time windows, not exact or guaranteed sleep and wake times.
- Actual sleep quality can be affected by sleep interruptions, health conditions, medication, stress, age and other factors.
