The best bedtime starts with the time you must get up. Subtract the sleep you need, then allow time to fall asleep. There is no single clock time that suits everyone. Use the chart below as a starting point, then adjust it to your own routine.
What time should I go to bed if I wake up at 7 AM?
If you plan for eight hours asleep and allow 15 minutes to fall asleep, aim to be in bed at 10:45 PM. Nine hours gives 9:45 PM; seven hours gives 11:45 PM. These are arithmetic examples, not measurements of your sleep or promises that you will wake refreshed.
Bedtime chart by wake-up time
Each bedtime includes a 15-minute allowance before sleep. The hours in the headings refer to planned time asleep.
| Wake up | 9 hours | 8 hours | 7 hours |
|---|---|---|---|
| 5 AM | 7:45 PM | 8:45 PM | 9:45 PM |
| 6 AM | 8:45 PM | 9:45 PM | 10:45 PM |
| 7 AM | 9:45 PM | 10:45 PM | 11:45 PM |
| 8 AM | 10:45 PM | 11:45 PM | 12:45 AM |
For a different alarm time, use the bedtime calculator. If you are already heading to bed, switch to the wake-up time calculator. Keep enough total sleep as the first priority.
Choose a sleep duration before a cycle count
The NHS says adults generally need seven to nine hours. Age matters: the CDC sleep-duration guide gives different ranges for children, teenagers and older adults. Our bedtime by age guide helps connect those ranges to a morning schedule.
The calculator uses 90-minute blocks, so a 7 AM alarm can produce 9:45 PM for nine hours or 11:15 PM for seven and a half hours. The eight-hour example in this chart is also a valid duration to plan around. You do not need to force your sleep into an exact multiple of 90 minutes.
Allow for the time you actually spend awake
Fifteen minutes is a planning assumption. If you usually take 30 minutes to fall asleep, move the chart bedtime 15 minutes earlier. Time in bed and time asleep differ; a midnight-to-8 AM interval is eight hours in bed, but less sleep if you are awake during it. Read about sleep latency before treating any calculator result as exact.
Try a routine you can repeat
- Choose a wake-up time that works on ordinary work or school days.
- Choose a duration appropriate for your age and circumstances.
- Count backward and leave time for a quiet bedtime routine.
- Record your actual times and how you feel, rather than changing the plan after every unusual night.
Use our weekly sleep tracker to compare entries, or print the seven-day sleep diary. A schedule that shifts substantially across the week is a different problem from simply picking a bedtime; see our circadian rhythm guide.
Can a calculator guarantee that I avoid deep sleep?
No. NHLBI describes cycles repeating roughly every 80–100 minutes, with their makeup changing across the night. Clock arithmetic cannot determine your current stage. See how sleep cycles work for the limitations.
When a schedule change is not enough
If sleep problems persist for months or affect your ability to cope with daily life, the NHS advises speaking to a GP. Do not keep shortening your sleep to chase a better calculator result.