Sleep Calculator
Calculate optimal bedtime and wake-up times based on 90-minute sleep cycles. Wake up feeling refreshed by timing your sleep right.
What would you like to calculate?
I want to wake up at:
:
Calculations include ~15 minutes to fall asleep.
Recommended Bedtimes
9:45 PM
6 sleep cycles (9 hours)
11:15 PM
5 sleep cycles (7.5 hours)
12:45 AM
4 sleep cycles (6 hours)
About Sleep Cycles
- Each sleep cycle lasts approximately 90 minutes.
- Waking between cycles helps you feel more refreshed.
- Most adults need 5-6 complete cycles (7.5-9 hours) per night.
- It takes the average person about 15 minutes to fall asleep.
- Consistency in sleep schedule is key for quality rest.