Sleep Cycles
Wake up refreshed
Stop guessing your bedtime. Your brain sleeps in 90-minute cycles. Waking up at the end of a cycle helps you feel energized instead of groggy. Sync your alarm with your body’s rhythm below.
If you head to bed right now…
You should try to fall asleep at:
(Allowing 15 min to fall asleep)
A good night’s sleep usually consists of 5-6 complete sleep cycles.
Sleep Cycles
Waking up in the middle of a sleep cycle can leave you feeling groggy and tired, even if you slept for a long time.
The 90-Minute Rule
A typical sleep cycle lasts about 90 minutes. The goal is to wake up at the end of a cycle, when your body is naturally closer to wakefulness.
This calculator adds 15 minutes to the fall-asleep time (average for most humans) to ensure accuracy.