Sleep Calculator
Find the best time to sleep or wake up
How Sleep Cycles Work
- Average sleep cycle lasts 90 minutes
- A full night's sleep includes 5-6 cycles
- Waking mid-cycle causes grogginess
- Most adults need 7-9 hours of sleep
Sleep Recommendations by Age
- Adults (18-64): 7-9 hours
- Older Adults (65+): 7-8 hours
- Teenagers (14-17): 8-10 hours
- School Age (6-13): 9-11 hours