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 the minutes it takes 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.