Working back from a 7:00 AM alarm
A sleep cycle lasts about 90 minutes. Counting back from 7:00 AM in whole cycles, and adding 15 minutes to fall asleep, gives:
- 9:45 PM (21:45) for six cycles, or 9 hours asleep;
- 11:15 PM (23:15) for five cycles, or 7.5 hours;
- 12:45 AM (00:45) for four cycles, or 6 hours.
These bedtimes aim to have your alarm ring as a cycle ends, when sleep is lighter and waking feels less abrupt.
Which 7 AM bedtime should you choose?
11:15 PM is the everyday choice for most adults. It gives 7.5 hours, above the 7-hour minimum recommended for adults, with a full evening before it.
9:45 PM gives 9 hours. It fits teenagers, who are recommended 8–10 hours, and anyone going through a period of poor or short sleep.
12:45 AM gives 6 hours. It is manageable once in a while, but not as a routine.
If you take more or less than 15 minutes to fall asleep
These times assume you fall asleep in 15 minutes. If you take longer, go to bed earlier by the extra time. The highlighted row matches the answer at the top of this page.
| Fall asleep in | 9 h | 7.5 h | 6 h |
|---|---|---|---|
| 5 min | 9:55 PM21:55 | 11:25 PM23:25 | 12:55 AM00:55 |
| 10 min | 9:50 PM21:50 | 11:20 PM23:20 | 12:50 AM00:50 |
| 15 min | 9:45 PM21:45 | 11:15 PM23:15 | 12:45 AM00:45 |
| 20 min | 9:40 PM21:40 | 11:10 PM23:10 | 12:40 AM00:40 |
| 30 min | 9:30 PM21:30 | 11:00 PM23:00 | 12:30 AM00:30 |
Why 11 PM is slightly off for a 7 AM alarm
Plenty of people go to bed at 11:00 PM and set their alarm for 7:00 AM. That gives about 7 hours 45 minutes of sleep, which is a healthy amount, but the alarm comes about 15 minutes into a new cycle. If you often wake up groggy, moving bedtime to 11:15 PM, or the alarm to 6:45 AM, may help. See wake-up times if you sleep at 11 PM.
Cycle timing is only a rough guide, though. Getting enough sleep and keeping regular times matter more than hitting a cycle to the minute.
A sample evening for an 11:15 PM bedtime
A 7:00 AM alarm leaves a full evening, which is exactly why bedtime tends to drift. A simple plan:
- Mid-afternoon: switch to decaffeinated drinks.
- 8:00 PM: evening meal finished.
- 10:30 PM: last episode or scroll; set a reminder so this is a decision, not an accident.
- 10:45 PM: wind down: phone on charge outside the bedroom, lights low.
- 11:15 PM: in bed, asleep by about 11:30 PM, for five full cycles.
- 7:00 AM: up with the alarm, and daylight within the first hour.
A 7 AM alarm and the school run
7:00 AM is one of the most common wake-up times for school days. The bedtimes above are for adults; children and teenagers need more:
- School-age children (6–12): 9–11 hours, so asleep between about 8:00 PM and 10:00 PM. See sleep for a 10-year-old.
- Teenagers (13–17): 8–10 hours, so asleep between about 9:00 PM and 11:00 PM. The 9:45 PM bedtime above gives 9 hours. See sleep for a 14-year-old.
If your teenager struggles to fall asleep early, morning daylight and phones out of the bedroom usually help more than an earlier lights-out alone.
Making 7 AM feel easy
A 7:00 AM alarm is one of the most common, and it becomes easier when your body expects it. Try to get up at about the same time on weekends, within roughly an hour. Open the curtains or get outside soon after waking, since morning light helps set your body clock. In the evening, dim the lights and put screens away for the last half hour before 11:15 PM.
More answers
- Bedtime for a 6:45 AM wake-upNearby answer
- Bedtime for a 7:15 AM wake-upNearby answer
- Bedtime for a 6:30 AM wake-upNearby answer
- Bedtime for a 7:30 AM wake-upNearby answer
- Wake-up time if you sleep at 8 PMRelated answer
- Wake-up time if you sleep at 8:30 PMRelated answer
- Wake-up time if you sleep at 9 PMRelated answer
- Wake-up time if you sleep at 9:30 PMRelated answer
Frequently asked questions
Is 11:15 PM a good bedtime for a 7 AM alarm?
Yes. Allowing 15 minutes to fall asleep, an 11:15 PM (23:15) bedtime gives five full cycles, or 7.5 hours of sleep, before 7:00 AM.
Is 11 PM too late for a 7 AM alarm?
No. It gives about 7 hours 45 minutes of sleep, which meets the adult recommendation. The alarm may fall early in a new cycle, so 11:15 PM can feel slightly easier to wake from.
What time should a teenager go to bed to wake up at 7 AM?
Teenagers are recommended 8–10 hours of sleep. A 9:45 PM (21:45) bedtime gives 9 hours, which falls in that range; 11:15 PM gives 7.5 hours, which is below it.
Related calculators
Bedtime calculator
Enter any wake-up time to see bedtimes that let you wake between sleep cycles.
Wake-up time calculator
Going to bed now or at a set time? Find wake-up times that land at the end of a cycle.
Sleep needs by age
See the recommended hours of sleep for any age, from newborns to older adults.
Sleep debt calculator
Add up the last seven nights and see how far you are from your sleep target.
Sources
- National Institute of Neurological Disorders and Stroke. Brain Basics: Understanding Sleep.
- Watson NF, et al. Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society. Journal of Clinical Sleep Medicine, 2015;11(6):591–592. doi:10.5664/jcsm.4758.
- Hirshkowitz M, et al. National Sleep Foundation’s sleep time duration recommendations: methodology and results summary. Sleep Health, 2015;1(1):40–43. doi:10.1016/j.sleh.2014.12.010.
- Centers for Disease Control and Prevention. About Sleep.
When to seek help
Talk to a doctor if you:
- regularly take longer than 30 minutes to fall asleep, or wake in the night and can’t get back to sleep;
- snore loudly, or someone notices you gasp or stop breathing while asleep;
- feel very sleepy during the day, especially while driving or working, despite enough time in bed.