Sleep Cycle Timer
A full sleep cycle runs about 90 minutes, which is why waking at a cycle boundary tends to feel easier than waking 20 minutes into one.
1:30:00Sleep Cycle Timer
Keep this tab open — the countdown stays accurate in the background, and the alarm sounds when it reaches zero.
What a sleep cycle timer is good for
Rest, breathing, and hygiene routines are all easier to do properly when something else is keeping time — most people cut them short by a wide margin when estimating. Start the countdown, put the device down, and let the alarm decide when you're finished.
- Timing a longer restorative nap
- Planning a bedtime around whole cycles
- Timing a nap on a night shift schedule
- A long rest block during recovery from illness
How long is 90 minutes?
| Unit | 90 minutes equals |
|---|---|
| In seconds | 5,400 seconds |
| In minutes | 90 minutes |
| In hours | 1.5 hours |
| On the clock | 1:30:00 |