Online Sleep Cycle Calculator - Recommended Best Wake-Up Time
A complete sleep cycle is approximately 90 minutes
Waking up at the end of a sleep cycle will make you feel more refreshed
I want to wake up at this time:
I want to sleep at this time:
Suggested Times
* Accounts for 15 minutes to fall asleep
Tool Description
Sleep Cycle Theory: Human sleep is divided into multiple 90-minute cycles, each containing light sleep, deep sleep, and rapid eye movement (REM) sleep.
Waking up at the end of a cycle is easier than waking up in the middle, and will make you feel more energized.
Recommended sleep duration: Adults 7.5-9 hours per night (5-6 cycles)