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Find the best bedtime or wake-up time based on 90-minute sleep cycles.
ProductivityCalculation includes an average 15 min to fall asleep.
Choose whether you want to know what time to wake up or what time to go to bed.
Enter your target sleep time or target wake-up time.
Account for approximately 15 minutes to fall asleep (sleep onset latency).
View the recommended times based on 4, 5, or 6 complete sleep cycles.
Find the best alarm time so you wake up naturally at the end of a sleep cycle instead of mid-dream.
Calculate the ideal nap duration (20 min for a power nap, or 90 min for a full cycle) to avoid sleep inertia.
Optimize sleep schedules around irregular work shifts to get the most recovery from shorter sleep windows.
Adjust sleep timing after long-haul flights to help your body clock sync to a new time zone faster.
Sleep Calculator helps you find the optimal bedtime or wake-up time based on 90-minute sleep cycles. Waking at the end of a complete cycle leaves you feeling refreshed instead of groggy.
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