Sleep Calculator
Calculate ideal sleep and wake times based on 90-minute sleep cycles. Find when to sleep or when to wake up.
I need to wake up at...
I want to go to sleep at...
If I go to sleep right now...
Sleep Cycle Information
How Sleep Cycles Work
- Each sleep cycle lasts approximately 90 minutes
- A good night's sleep consists of 5-6 complete cycles
- Waking between cycles leaves you feeling refreshed
- It takes the average person ~14 minutes to fall asleep
- This calculator factors in the 14-minute fall-asleep time
Recommended Sleep by Age
| Teens (14-17) | 8-10 hours |
| Young Adults (18-25) | 7-9 hours |
| Adults (26-64) | 7-9 hours |
| Older Adults (65+) | 7-8 hours |
More Productivity tools at toool.cc