Sleep Calculator
Sleep cycles are roughly 90 minutes. Waking between cycles can help you feel more refreshed. Enter when you want to wake (or go to bed) and we suggest times based on cycle boundaries.
Sleep Calculator
How it works
We add or subtract multiples of 90 minutes from your target time and show options. For example: wake at 7:00 → consider bed at 21:30, 23:00, 00:30, etc.
When to use it
Use it to plan bedtime or alarm so you wake after a full cycle. Not a substitute for medical sleep advice.
Frequently asked questions
Is 90 minutes exact for everyone?
No. Cycle length varies. Use this as a guide and adjust to how you feel.
What about fall-asleep time?
We add ~15 minutes to reach the first cycle start so you have time to fall asleep.