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Sleep Calculator
Calculate bedtime from wake time, desired sleep duration, and the time needed to fall asleep.
- Go to bed at
- 22:45
- Day relative to waking
- Previous day
How the calculation works
Bedtime is sleep duration plus sleep-onset time before the wake-up time.
Inputs
- Wake-up time
- Desired sleep duration, hours
- Time to fall asleep, minutes
Calculation details
CDC recommends at least 7 hours for adults aged 18–60. Individual needs vary.
The calculation does not assume fixed 90-minute cycles or guarantee easy waking. Seek professional advice for persistent sleep difficulties.
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Sources
Updated: 2026-10-02