What Time Should I Go to Sleep? — Complete Guide 2026
By MySleepCalculator Editorial Team
Last updated: Jan 1, 2026
The best time to go to sleep depends on when you need to wake up and how many 90-minute sleep cycles you want. This guide explains the science and how to use our free sleep calculator.
Why Bedtime Matters
Going to bed at the right time isn’t just about total hours—it’s about finishing full sleep cycles. Each cycle is roughly 90 minutes and includes light sleep, deep sleep, and REM. Waking in the middle of deep sleep causes grogginess; waking at the end of a cycle helps you feel refreshed.
How to Find Your Best Bedtime
Start with your wake-up time. Count back in 90-minute blocks and add about 15 minutes for the time it usually takes you to fall asleep. For a 7:00 AM wake-up, that means bedtimes around 9:45 PM (6 cycles), 11:15 PM (5 cycles), or 12:45 AM (4 cycles). Most adults do best with 5–6 cycles (7.5–9 hours).
Factors That Change Your Ideal Bedtime
Age, schedule, and lifestyle all matter. Teenagers often need 8–10 hours; older adults may need 7–8. Shift workers and parents of young children may need to adjust. Consistency is key: going to bed and waking at similar times each day helps your body lock in a stable rhythm.
Use Our Free Sleep Calculator
Instead of doing the math yourself, use our sleep calculator. Enter your wake-up time and get instant bedtime options based on 4, 5, or 6 complete sleep cycles. You can also set a quick browser alarm from the suggested times.
Related Sleep Resources
- Bedtime Calculator tool page.
- Wake Up Time Calculator for reverse planning.
- 90 Minute Sleep Cycles Explained.