Sleep cycles
Sleep Calculator
When do you have to get up? The best bedtimes by 90-minute cycles, or the other way round: when you should wake up.
A sleep cycle lasts about 90 minutes on average, falling asleep about 15. The calculator counts backwards from your wake-up time or forwards from bedtime and marks the moments when a cycle ends. Five to six cycles are the goal. More in Deep sleep and recovery.
Not medical advice: the calculator classifies, it does not diagnose.
