Find Your Perfect Sleep Time in Seconds
Wake up refreshed with our free sleep cycle calculator.
Calculate NowSleep Calculator
Enter your desired wake-up time to calculate the best times to go to sleep based on 90-minute sleep cycles.
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Why Sleep Cycles Matter
Humans sleep in 90-minute cycles that alternate between light sleep, deep sleep, and REM (dream) sleep. Waking up in the middle of a sleep cycle can leave you feeling groggy and tired, even if you’ve had plenty of sleep.
Our calculator helps you wake up at the end of a sleep cycle when you’re in your lightest sleep phase. This makes waking up easier and helps you feel more refreshed and alert throughout the day.
Most adults need 5-6 complete sleep cycles per night (7.5-9 hours), but quality is just as important as quantity. By timing your sleep to match your natural cycles, you can maximize the restorative benefits of your sleep.
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