Quick answer: For many adults, a nap of roughly 10–20 minutes is a useful starting point when time is limited. A longer nap can provide more sleep but may leave you groggy. The best length depends on your schedule, sleep needs and how you feel after waking.
An afternoon slump does not always require an elaborate sleep setup. A short rest can make it easier to finish the day, while a longer planned nap may fit better before a night shift or after a very short night. Neither is a reliable substitute for regularly getting enough sleep.
How long should you nap?
10–20 minutes: a practical starting point
Short naps are often used for a quick alertness boost and can reduce the chance of waking from deeper sleep. Set aside a little more time than the desired sleep duration if you usually need time to fall asleep. Even then, you may feel groggy, especially if you are very sleep deprived.
Around 30–60 minutes: more sleep, possible grogginess
A longer rest gives you more opportunity to sleep, but it can also increase the chance of waking from deeper sleep. People differ in how quickly they fall asleep and which stages they reach. Schedule extra time to wake up before you need to perform demanding work.
Around 90 minutes: a longer opportunity for sleep
A longer nap may be useful when your schedule permits, particularly before a night shift. The CDC’s NIOSH guidance discusses roughly 20 and 90 minutes as points at which sleep inertia may be less pronounced. Sleep cycles vary, however: setting a 90-minute alarm does not guarantee a complete cycle or a clear-headed awakening.
Why you may feel groggy afterward
Sleep inertia is the temporary period of reduced alertness after waking. It can follow any nap and may last longer when you are sleep deprived or wake from deeper sleep. Give yourself time to become fully alert before driving, operating equipment or making safety-critical decisions. A walk or light can be part of your transition back to activity, but do not treat them as a guarantee that impairment has passed.
If you are already drowsy while driving, pull over to a safe place. Napping or caffeine can be temporary countermeasures; they do not make continued driving safe if you still feel sleepy. Arrange another way home or rest longer if needed.
When is the best time to nap?
For a conventional daytime schedule, early afternoon often works well. Napping close to bedtime can make it harder for some people to fall asleep at night, but there is no universal cutoff: try a shorter, earlier nap if your evenings are affected. Shift workers may need a different schedule; planned naps before or during a shift can be useful when their workplace and duties allow.
If you have ongoing insomnia, discuss napping with a clinician or CBT-I provider. Depending on your situation, they may suggest limiting naps while you rebuild a consistent nighttime sleep schedule.
Make a short nap easier
- Choose a safe, quiet place and a comfortable position that supports your neck.
- Use an alarm you can hear, and allow a few minutes to fall asleep.
- Reduce light and noise if they bother you; an eye mask or earplugs can help.
- Build in time to wake up rather than scheduling a nap right up to an important task.
- If you cannot sleep, a quiet break can still be pleasant, though it is not the same as sleep.
For ideas on setting up a rest space, see our nap accessories guide.
Frequently asked questions
Is a 30-minute nap bad?
No. It may work well for you, though some people wake groggy. Try a shorter nap if you need to be alert quickly.
Does a nap replace a full night of sleep?
No. Naps can supplement sleep but should not become a workaround for chronic sleep deprivation.
When should I talk to a professional?
If you often feel excessively sleepy despite enough time in bed, or you snore loudly, gasp or have breathing pauses during sleep, ask a clinician for an evaluation. Drowsiness that affects driving deserves prompt attention.