Counting forward from 5:00 AM
If you get into bed at 5:00 AM and fall asleep about 15 minutes later, your first sleep cycle starts at 5:15 AM. Adding cycles of about 90 minutes gives:
- 11:15 AM (11:15) after four cycles, or 6 hours asleep;
- 12:45 PM (12:45) after five cycles, or 7.5 hours;
- 2:15 PM (14:15) after six cycles, or 9 hours.
Which wake-up time fits a 5 AM bedtime?
12:45 PM gives 7.5 hours, above the 7-hour minimum recommended for adults. For most night-shift workers it leaves time for the afternoon before the next shift.
2:15 PM gives 9 hours, useful after a run of short sleeps or before a demanding shift.
11:15 AM gives 6 hours. Daytime sleep is often lighter and more broken than night sleep, so 6 hours in the day can feel like less.
If you take more or less than 15 minutes to fall asleep
The times above allow 15 minutes to fall asleep. After a night shift, many people take longer to drop off. Use the row that matches you; the highlighted row matches the answer at the top.
| Fall asleep in | 9 h | 7.5 h | 6 h |
|---|---|---|---|
| 5 min | 2:05 PM14:05 | 12:35 PM12:35 | 11:05 AM11:05 |
| 10 min | 2:10 PM14:10 | 12:40 PM12:40 | 11:10 AM11:10 |
| 15 min | 2:15 PM14:15 | 12:45 PM12:45 | 11:15 AM11:15 |
| 20 min | 2:20 PM14:20 | 12:50 PM12:50 | 11:20 AM11:20 |
| 30 min | 2:30 PM14:30 | 1:00 PM13:00 | 11:30 AM11:30 |
Making daytime sleep work
Sleeping after sunrise is harder than sleeping at night, because daylight and noise tell your body clock it is time to be awake. A few changes make a real difference:
- Use blackout curtains or an eye mask, and earplugs or a fan for steady background noise.
- Put your phone on silent and let others in your home know when you are sleeping.
- Keep the bedroom cool, as it usually warms up during the day.
- On the way home after a night shift, some people find sunglasses help them feel less wide awake.
- Avoid caffeine in the last few hours before your planned bedtime.
A routine for regular night shifts
If you work nights regularly, try to sleep at the same times after each shift and keep a similar pattern on days off where you can. Some people split their sleep, with a main sleep after the shift and a short nap before the next one. If you often feel exhausted or struggle to sleep despite good habits, talk to a doctor.
More answers
- Wake-up time if you sleep at 4 AMNearby answer
- Wake-up time if you sleep at 3 AMNearby answer
- Bedtime for a 4 AM wake-upRelated answer
- Bedtime for a 4:15 AM wake-upRelated answer
- Bedtime for a 4:30 AM wake-upRelated answer
- Bedtime for a 4:45 AM wake-upRelated answer
Frequently asked questions
Is going to bed at 5 AM bad for you?
Not in itself, if you still get enough sleep and keep a regular pattern. Allowing 15 minutes to fall asleep, a 5:00 AM bedtime gives 7.5 hours with a 12:45 PM (12:45) alarm.
How much sleep do I get from 5 AM to noon?
About 6 hours 45 minutes, if you fall asleep by 5:15 AM. That is a little below the adult minimum of 7 hours, and the alarm falls partway through a cycle.
Why is it so hard to sleep after a night shift?
Your body clock is set to be awake in daylight, so daytime sleep tends to be lighter and shorter. A dark, quiet, cool bedroom and a regular schedule make it easier.
Related calculators
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.
Bedtime calculator
Enter any wake-up time to see bedtimes that let you wake between sleep cycles.
Nap calculator
Plan a 10-, 20- or 90-minute nap and see when to set your alarm.
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.
- National Heart, Lung, and Blood Institute. How Sleep Works.
- 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.
- 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.