Sleep Cycle Calculator.

Wake up refreshed — timed to your natural 90-minute sleep cycles

I'm going to sleep now
When should I wake up?
I want to wake up at…
When should I go to sleep?
You fall asleep around
(now + 15 min)
Best times to wake up
Each sleep cycle lasts 90 minutes. We add 15 minutes to fall asleep. Waking up mid-cycle can leave you groggy — these times align with the end of a cycle so you wake up naturally refreshed.