Sleep Time Calculator

Calculate the best time to go to bed or wake up based on sleep cycles. Each cycle lasts about 90 minutes.

I want to calculate: Best time to wake up Best time to go to bed

When do you want to wake up?

When do you want to go to bed?

Your Ideal Sleep Times

Sleep cycles typically last 90 minutes. Waking up at the end of a sleep cycle helps you feel more refreshed. Most adults need 5-6 complete sleep cycles (7.5-9 hours) per night.