Sleep Calculator
Calculate the best times to wake up or go to bed based on sleep cycles
Sleep Time Calculator
cycles
Results
Sleep Cycle Chart
About Sleep Cycles
A full sleep cycle takes about 90 minutes to complete, with 4 distinct stages:
N1 (Light Sleep)
Transition between wakefulness and sleep
N2 (True Sleep)
Body temperature drops, heart rate slows
N3 (Deep Sleep)
Restorative sleep, hard to wake from
REM Sleep
Dreaming occurs, brain is active
Sleep Tip
Waking up at the end of a sleep cycle (after 90 minutes multiples) helps you feel more rested.