Sleep Calculator
Find the best bedtime or wake-up time by sleep cycles.
To wake refreshed, fall asleep at one of these times:
09:45 PM
6 cycles · 9h
11:15 PM
5 cycles · 7.5h
12:45 AM
4 cycles · 6h
Sleep cycles run about 90 minutes. Enter a wake-up or bedtime to find times that let you wake between cycles.
How to use
- Choose wake-up or bedtime mode.
- Enter your time.
- Pick one of the suggested times.
Frequently asked questions
- Why 90 minutes?
- A full sleep cycle averages about 90 minutes; waking between cycles feels easier.
- Why 15 extra minutes?
- It allows an average 15 minutes to fall asleep.