Sleep Cycle Calculator
Scientifically plan sleep and wake times based on sleep cycles
Hour Quality Tools
Sleep Planning
Scientifically plan your sleep time based on sleep cycles
About Sleep Cycles
A sleep cycle refers to the different stages a person goes through during sleep, with each complete cycle lasting about 90 minutes. Waking up at the end of a sleep cycle will make you feel more refreshed and energized.
- A complete sleep cycle includes light sleep, deep sleep, and REM (Rapid Eye Movement) sleep
- Adults are recommended to get 5-6 complete sleep cycles per night (7.5-9 hours)
- Waking up between sleep cycles is easier than waking up in the middle of a cycle