What Is Napping? Naps, Power Naps and Siestas Explained

Nap, power nap or siesta: what is the difference?

Nap is the broad everyday term for sleep outside your main sleep period. Power nap usually means a brief nap of about 10 to 20 minutes intended to help you feel more alert afterwards. The word “power” is not a promise about how you will feel when the alarm rings.

Siesta refers to a rest or sleep around the middle of the day. It is a tradition in Mediterranean and Latin American countries, among others. These labels do not define one universal number of minutes.

Why people nap

A review by Dhand and Sohal points out that millions of people around the world nap during the day: out of habit, because of short nights or sleep disorders, or after a long work shift. Napping happens in every age group, from infants to older adults. [1]

Milner and Cote describe napping as a cross-cultural phenomenon across the whole lifespan. People differ widely in how often they nap and in how much they benefit. [2]

What a short nap does

The best-documented effect of a nap is on alertness. According to Dhand and Sohal, naps as short as 10 minutes can improve performance, and naps under 30 minutes have several benefits, while longer naps are more often followed by grogginess. [1]

French researchers even describe the nap as a possible “public health tool” against the consequences of sleep debt, for example to reduce sleepiness at work or on the road. At the same time, they stress that much depends on nap length, frequency and age. [3]

The siesta: more than a cliché?

The siesta is often seen as a lazy habit. Research paints a more interesting picture. In a large Greek study with more than 23,000 adults, people who regularly took a siesta had a lower coronary mortality over about six years than those who did not, even after accounting for factors like diet and physical activity. [4]

That is an association, not proof that a siesta protects the heart. But it shows that midday rest is worth taking seriously. Read more in are naps good for you?

Does lying with your eyes closed count?

If you stay awake, you are resting rather than sleeping. That does not make the pause a failed nap. A quiet break with closed eyes can still feel good, and you do not need to prove that sleep happened.

Think of two different goals: giving yourself a pause, and actually falling asleep. You can arrange the first; the second is not a button you press. A phone timer records elapsed time, so a completed session does not tell you exactly how much of it you slept.

How short is a short nap?

NHLBI recommends that adults limit naps to no more than 20 minutes. It also advises limiting naps or taking them earlier if you have trouble falling asleep at night. [5] Time on a timer and actual sleep are different, so use this guidance to plan a brief opportunity rather than to measure sleep.

For details, read about nap duration and the best time to nap. A longer nap is not automatically a better pause.

A simple first-break example

Imagine a free half hour in the early afternoon. Choose somewhere comfortable, decide when you need to be back, and leave room on both sides of the timer. For example: three minutes to settle in, a 15-minute countdown and the remaining time to get up without rushing.

This is a scheduling example, not a tested formula for recovery. If you stay awake, finish the break at the planned time. If you wake feeling foggy, allow more time before demanding tasks. Our timer guide explains the calculation.

Common beginner questions

Do I need an app?

No. An ordinary alarm can mark the end of your break. An app can make your preferred timer, sounds and settling-in time easier to reuse.

Must I nap every day?

No. Start with a break that fits your day instead of creating another daily obligation. Naps do not replace your main sleep. [3]

Do animals take naps too?

Some do, though their sleep patterns can be very different. Meet five examples in our animal nap facts.