What time should I go to sleep to wake up at 11:15 PM?
Based on 90-minute sleep cycles. Go to bed at one of these times to wake up at 11:15 PM feeling refreshed.
Best bedtimes for 11:15 PM wake-up
3:30 PM or 2:00 PM
5–6 sleep cycles · 7.5–9 hours · CDC recommended for adults
How this is calculated
Your body moves through 90-minute sleep cycles — each one contains light sleep, deep sleep, and REM. Waking up at the end of a cycle means less grogginess.
This calculator works backwards from your 11:15 PM wake time. It subtracts complete 90-minute cycles, then adds a 15-minute fall-asleep buffer so your timing is accurate from when you actually fall asleep.
Most adults need 5–6 cycles (7.5–9 hours) per the CDC. The bedtimes highlighted as “Recommended” hit that range.
All bedtimes if you wake at 11:15 PM
| Bedtime | Sleep cycles | Hours of sleep | Quality |
|---|---|---|---|
| 2:00 PM | 6 | 9h | Recommended |
| 3:30 PM | 5 | 7.5h | Recommended |
| 5:00 PM | 4 | 6h | Minimum |
| 6:30 PM | 3 | 4.5h | Minimum |
| 8:00 PM | 2 | 3h | Minimum |
| 9:30 PM | 1 | 1.5h | Minimum |
Frequently asked questions
What time should I go to sleep if I wake up at 11:15 PM?▾
Go to bed at 3:30 PM or 2:00 PM to wake up at 11:15 PM after 5–6 complete sleep cycles (7.5–9 hours). These are the CDC-recommended amounts for adults.
Why are sleep times based on 90-minute cycles?▾
Your brain cycles through light sleep, deep sleep, and REM roughly every 90 minutes. Waking at the end of a cycle instead of the middle dramatically reduces grogginess (sleep inertia).
Why is a 15-minute buffer added to bedtimes?▾
The average person takes 10–20 minutes to fall asleep. Adding 15 minutes ensures your cycles are timed from when you actually fall asleep, not just when you get into bed.
Similar wake-up times
Want to calculate from a different time? Use the full sleep calculator →