Wake at the end of a cycle
😴 Sleep Cycles
Sleep runs in ~90-minute cycles, waking mid-cycle leaves you groggy. Enter when you must wake up (or when you go to bed) and get the best bedtimes or alarm times, counting time to fall asleep.
Fall-asleep15′
Cycle length varies 80–100 minutes per person; 90 is the average. 5–6 full cycles (7.5–9 h) suits most adults. If one suggestion feels wrong, shift by ±15 minutes over a few nights and note when mornings feel easiest.