Sleep Calculator — Best Bedtime & Wake Time
Find the best time to go to sleep or wake up based on 90-minute sleep cycles. Wake up refreshed every morning.
Sleep happens in 90-minute cycles. Waking at the end of a cycle — rather than in the middle — means you feel more refreshed and alert. Enter your wake-up time or bedtime and the calculator shows you the ideal times to sleep or rise.
Formula: Sleep time = (cycles × 90 min) + 14 min to fall asleep