Sleep Time Calculator
Calculate the best time to go to sleep or wake up based on 90-minute sleep cycles. Wake up feeling refreshed and energized.
I want to wake up at...
7
00
AM
To wake up refreshed, try going to bed at one of these times (includes 15 min to fall asleep):
09:45 PM
6 Cycles (9 hrs)11:15 PM
5 Cycles (7.5 hrs)12:45 AM
4 Cycles (6 hrs)02:15 AM
3 Cycles (4.5 hrs)I am going to sleep at...
10
30
PM
If you go to sleep now, try waking up at one of these times to feel rested:
03:15 AM
3 Cycles (4.5 hrs)04:45 AM
4 Cycles (6 hrs)06:15 AM
5 Cycles (7.5 hrs)07:45 AM
6 Cycles (9 hrs)Sleep Cycle Calculator
A good night's sleep consists of 5-6 complete sleep cycles. Waking up in the middle of a sleep cycle can leave you feeling groggy and tired. Use this calculator to find the perfect bedtime based on when you want to wake up, or find out when to set your alarm if you're going to sleep right now.