Optimize your bedtime or wake-up time based on natural 90-minute REM sleep cycles to wake up feeling refreshed and energized.
Waking up in the middle of a deep sleep cycle makes you feel groggy and tired, even if you slept for a long time. This tool calculates your natural 90-minute sleep cycles to tell you the exact time you should go to bed or wake up to feel completely refreshed.
If you need to wake up at a specific time (e.g., 07:00 AM), enter it into the tool. The calculator counts backward in 90-minute blocks to present the best times for you to fall asleep. Alternatively, click "Sleep Now" to see the best times to set your morning alarm.
Yes, 100% Free! Fix your sleep routine and beat morning fatigue using this simple, ad-free focus utility.