☀️ Napping Science
Best Time
to Take a Nap
When to nap, how long to nap and how to wake up refreshed instead of groggy — based on controlled sleep-lab studies.
When Is the Best Time to Nap?
For most people on a normal day schedule, the best time to nap is the early afternoon, and the best length is short — about 10 to 20 minutes.
If you are wondering about the best time to take a nap, sleep research points to a fairly clear answer: the early afternoon. For someone who sleeps from about 11 pm to 7 am, that usually means somewhere between 1 pm and 3 pm. A review of napping and cognition concluded that the early afternoon is the most favourable time for a nap, and that brief naps of about 5 to 15 minutes deliver benefits almost immediately that last for one to three hours.[2]
Why the early afternoon? Many people notice a slump in alertness after lunch and assume it is caused by the meal. Food can make it worse — especially a heavy, high-carbohydrate lunch — but the post-lunch dip is a real biological phenomenon that can appear even when people skip lunch and do not know what time it is. It is linked to a rise in sleep propensity driven by your circadian system.[3] A nap timed to that dip works with your biology rather than against it.
Length matters just as much as timing. A controlled study that compared afternoon naps of 5, 10, 20 and 30 minutes found that the 10-minute nap was the most effective overall: it improved sleepiness, fatigue, vigour and cognitive performance immediately, and some benefits lasted up to 155 minutes.[1] The infographic below summarises what each nap length did.
Nap Length Guide
What happened after afternoon naps of different lengths in sleep-lab studies
Few benefits compared with no nap at all.
Immediate gains in alertness and performance, with some lasting up to 155 minutes.
Improvements emerged about 35 minutes after waking and lasted up to 125 minutes.
A spell of sleep inertia, then improvements lasting up to 155 minutes.
With deep and REM sleep, a nap matched a night of sleep for perceptual learning — but expect grogginess.
How Long Should a Nap Be?
Different nap lengths do different jobs. The main trade-off is between a quick boost and the grogginess that follows deeper sleep.
| Nap length | What it does | Main downside | Best for |
|---|---|---|---|
| 5 minutes | Few measurable benefits over no nap[1] | Too short to help most people | Not recommended |
| 10 minutes | Immediate boost in alertness and performance; some benefits up to 155 min[1] | Benefits fade within a few hours | Workdays, study breaks |
| 20 minutes | Benefits appear about 35 min after waking and last up to 125 min[1]; improved mood and performance in the mid-afternoon[4] | Slightly slower to kick in | A classic power nap |
| 30 minutes | Grogginess first, then benefits up to 155 min[1] | Sleep inertia right after waking[1][6] | When you have time to wake up slowly |
| 60–90 minutes | Can include deep and REM sleep; supported perceptual learning like a full night[5] | Longer grogginess; may affect night-time sleep | Learning, recovering from a short night |
The reason short naps work so well comes down to sleep stages. In the first few minutes you are in light sleep. As a nap stretches beyond about 20 to 30 minutes, you become more likely to enter deep slow-wave sleep. Waking from deep sleep produces sleep inertia — that heavy, confused, slow feeling that can last a while after you open your eyes. A review of the evidence concluded that brief naps act almost immediately, while naps longer than 30 minutes can produce a short period of impairment from sleep inertia before giving a longer-lasting improvement.[2]
That does not make long naps bad. In a well-known study, a 60–90 minute nap that contained both slow-wave and REM sleep produced learning on a visual skill task that closely matched what people normally gained from a full 8-hour night of sleep.[5] If you are trying to consolidate something you have practised, and you have time to wake up properly afterwards, a longer nap that covers roughly one full sleep cycle can be worth it. You can learn more about how cycles work in our guide to Sleep Cycles Explained.
To pick an exact length for your situation, try the Nap Duration Calculator, which suggests a nap length and wake-up time based on when you lie down.
Why Timing Matters: Your Body Clock and Sleep Pressure
Two systems decide how easily you fall asleep and how refreshed you feel: your circadian rhythm and the sleep pressure that builds up while you are awake.
Your circadian rhythm is the roughly 24-hour clock that sets when you feel alert and when you feel sleepy. For most people it creates a small window of increased sleepiness in the early-to-mid afternoon — the post-lunch dip — on top of the main window at night.[3] Napping inside that afternoon window makes it easier to fall asleep quickly, which is important when the whole nap only lasts 10 or 20 minutes. Read more in Circadian Rhythm Explained.
The second system is sleep pressure, which builds steadily the longer you are awake and is released when you sleep. A nap releases a little of that pressure. That is exactly why it refreshes you — and also why a nap late in the day can make it harder to fall asleep at bedtime. The later and longer the nap, the more it can push back your night-time sleep.
Napping research also suggests that the right nap depends on how long you have been awake. Longer periods of prior wakefulness favour longer naps over brief ones, and people who nap regularly seem to get more benefit than people who rarely nap.[2] In practice, a habitual 15-minute afternoon nap often feels better than an occasional one, because you get used to falling asleep and waking quickly.
- 1
Early riser (wake around 5–6 am)
Your dip may come a little earlier — late morning to early afternoon, around 12–2 pm. Keep it short so it does not interfere with an early bedtime.
- 2
Typical schedule (sleep about 11 pm–7 am)
Aim for roughly 1–3 pm. This lines up with the natural post-lunch dip for most people.
- 3
Night owl (wake around 9–10 am)
Your dip shifts later, often around 3–4 pm. Avoid napping in the evening, which can delay your bedtime further.
- 4
Shift worker
A short nap before a night shift, or a brief break-time nap, can help. A 10-minute night-time nap caused minimal sleep inertia, while a 30-minute nap impaired performance immediately afterwards.[6] Plan around your rota with the Shift Work Sleep Planner.
How to Take the Perfect Nap
A few simple habits make the difference between waking up sharp and waking up groggy.
- 1
Set an alarm before you lie down
Allow a few minutes to fall asleep. For a 10–20 minute nap, set the alarm for about 20–25 minutes after you lie down.
- 2
Nap in the early afternoon
Use the post-lunch dip. Avoid naps in the last several hours before bedtime.
- 3
Make it dark, quiet and cool
An eye mask and earplugs help you fall asleep faster when time is limited.
- 4
Lie back, even if you do not sleep
Light dozing can still help. In one driving study, naps made up of “non-sleep dozing” were still effective.[7]
- 5
Try a caffeine nap when you must stay alert
Drink a cup of coffee and nap straight away for under 15 minutes. In a driving simulator study, 200 mg of caffeine plus a short nap cut driving incidents to 9% of placebo levels, compared with 34% for caffeine alone.[7] Check how long caffeine stays in your system with the Caffeine Half-Life Calculator.
- 6
Give yourself time to wake up
After a longer nap, get some light, move around and wait before driving or doing something important — your self-rating may not be reliable. In one study, people rated their performance as better after a nap even when objective tests showed it was worse.[6]
Is Napping Good for You?
For healthy adults, short naps are a useful tool. Long, frequent naps are a different story.
A review of napping in healthy adults concluded that an afternoon nap restores wakefulness and promotes performance and learning, and that naps as short as 10 minutes can improve performance. It also noted that naps under 30 minutes confer several benefits, while longer naps are associated with sleep inertia and lost productivity.[8]
The same review flagged a caution: epidemiological studies have linked frequent and long naps with poorer long-term health, especially in older adults.[8] These studies show an association, not cause and effect — people who are already unwell or sleeping badly at night may simply nap more. Still, a sudden increase in daytime sleepiness or a strong need for long daily naps is worth discussing with a doctor, because it can be a sign of a sleep disorder or another health problem.
Another review of nap research found that the benefits depend on nap length, time of day, age and whether you are used to napping.[9] Younger adults, older adults and habitual nappers may all respond differently, so it is worth experimenting for a week or two to find what works for you.
Students
A short nap after studying can help, and a longer nap with REM sleep may support some types of learning.[5]
Office workers
A 10–20 minute nap at lunchtime can offset the afternoon slump without hurting night sleep.
Drivers
If you feel sleepy at the wheel, stop safely. Caffeine plus a short nap was more effective than caffeine alone.[7]
Night-shift workers
Short naps help, but be careful of grogginess after naps of 30 minutes or more.[6]
Older adults
Keep naps short and early, and mention frequent long naps to your doctor.[8]
Poor sleepers
If you struggle to sleep at night, limit naps — they can reduce the sleep pressure you need at bedtime.
⏱️ Plan Your Perfect Nap
Find the right nap length and a wake-up time that avoids grogginess.
Frequently Asked Questions About Napping
For most people, the early afternoon — roughly 1 pm to 3 pm on a typical 11 pm to 7 am sleep schedule. This matches the natural post-lunch dip in alertness. Night owls may find a slightly later time works better, but avoid napping in the evening.
About 10 to 20 minutes. In a lab comparison of afternoon naps, a 10-minute nap gave the most immediate and lasting benefit, while a 20-minute nap helped after a short delay.
Naps of 30 minutes or more make it more likely that you wake from deep sleep, which causes sleep inertia — temporary grogginess and slower thinking. It usually passes, but it can take a while.
A 60–90 minute nap can include deep and REM sleep and has been shown to support learning on some tasks. It is best when you have time to wake up properly and it is early enough not to affect your night-time sleep.
It can. Naps release some of the sleep pressure you need to fall asleep at night. Short, early-afternoon naps usually have little effect, while long or late naps can make it harder to fall asleep.
A coffee nap means drinking coffee and then napping right away for under 15 minutes, so you wake up as the caffeine starts working. In a driving simulator study, this combination reduced sleepiness-related driving incidents more than caffeine alone.
A short daily nap is fine for many healthy adults. However, needing long naps every day can be a sign of poor night-time sleep or a health problem, so it is worth speaking to a doctor if this is new for you.
Related Sleep Resources
Put this guide into practice with our free calculators and in-depth guides.
References & Further Reading
- Brooks A, Lack L. (2006). A brief afternoon nap following nocturnal sleep restriction: which nap duration is most recuperative? Sleep, 29(6), 831–840. PubMed 16796222 · doi:10.1093/sleep/29.6.831
- Lovato N, Lack L. (2010). The effects of napping on cognitive functioning. Progress in Brain Research, 185, 155–166. PubMed 21075238 · doi:10.1016/B978-0-444-53702-7.00009-9
- Monk TH. (2005). The post-lunch dip in performance. Clinics in Sports Medicine, 24(2), e15–e23. PubMed 15892914 · doi:10.1016/j.csm.2004.12.002
- Hayashi M, Watanabe M, Hori T. (1999). The effects of a 20 min nap in the mid-afternoon on mood, performance and EEG activity. Clinical Neurophysiology, 110(2), 272–279. PubMed 10210616 · doi:10.1016/s1388-2457(98)00003-0
- Mednick S, Nakayama K, Stickgold R. (2003). Sleep-dependent learning: a nap is as good as a night. Nature Neuroscience, 6(7), 697–698. PubMed 12819785 · doi:10.1038/nn1078
- Hilditch CJ, et al. (2016). A 30-minute, but not a 10-minute nighttime nap is associated with sleep inertia. Sleep, 39(3), 675–685. PubMed 26715234 · doi:10.5665/sleep.5550
- Reyner LA, Horne JA. (1997). Suppression of sleepiness in drivers: combination of caffeine with a short nap. Psychophysiology, 34(6), 721–725. PubMed 9401427 · doi:10.1111/j.1469-8986.1997.tb02148.x
- Dhand R, Sohal H. (2006). Good sleep, bad sleep! The role of daytime naps in healthy adults. Current Opinion in Pulmonary Medicine, 12(6), 379–382. PubMed 17053484 · doi:10.1097/01.mcp.0000245703.92311.d0
- Milner CE, Cote KA. (2009). Benefits of napping in healthy adults: impact of nap length, time of day, age, and experience with napping. Journal of Sleep Research, 18(2), 272–281. PubMed 19645971 · doi:10.1111/j.1365-2869.2008.00718.x