Estimate bedtime based on sleep cycles and your desired wake time. Informational only.
Estimate bedtimes based on sleep cycles (90 minutes) plus 15 minutes to fall asleep. Informational only.
Many sleep tools estimate timing using 90‑minute cycles. This calculator suggests a bedtime based on your wake time and chosen cycle count, with an added buffer to fall asleep.
Some people feel better waking between cycles, but results vary.
Needs vary. Consistent schedule and quality sleep are important.