What Is the Best Time to Go to Sleep?
The best time to sleep depends on when you need to wake up — not on a fixed schedule. Sleep science shows that aligning bedtime with natural 90-minute sleep cycles is more important than total hours.
General guidelines by age:
- Adults (18–64): 7–9 hours recommended
- Seniors (65+): 7–8 hours
- Teens (14–17): 8–10 hours
But quality beats quantity: 5 complete sleep cycles (7.5 hours) beats 8 hours of broken sleep.
For a 7 AM wake-up, best bedtimes:
- 🌟 10:46 PM — 5 cycles (7.5 hrs) BEST
- ✅ 9:16 PM — 6 cycles (9 hrs)
- ⚠️ 12:16 AM — 4 cycles (6 hrs)
Your chronotype matters: Early birds feel best sleeping by 10 PM. Night owls perform better sleeping at midnight. Both are valid — align your schedule with your natural chronotype where possible.
Enter your wake-up time below to find your personal best bedtime.
Sleep Calculator
Find the perfect bedtime or wake-up time based on 90-minute sleep cycles. Wake up refreshed, not groggy.
What time do you want to wake up?
Why 90-minute cycles?
During sleep your brain moves through cycles of light sleep, deep sleep, and REM sleep. Each cycle takes about 90 minutes. Waking at the end of a cycle — not in the middle — is why you feel refreshed instead of groggy.
How much sleep do you need?
- Teens (14–17): 8–10 hours
- Adults (18–64): 7–9 hours
- Seniors (65+): 7–8 hours
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