What Is a Catnap? A Brief Doze, Not a Fixed Duration

A catnap is a very short, light nap—a brief doze rather than a long sleep. That is the Merriam-Webster definition. The word does not specify an exact number of minutes.

For example: “I took a catnap after lunch before returning to work.” As a verb, to catnap means to take that brief nap.

If you want to turn the definition into a routine, 10–20 minutes of sleep is a reasonable starting target for a healthy adult seeking a short alertness break, based on the short-nap study below. That is practical nap advice, not a rule about what the word means.

How long should a catnap last?

Short-nap research supports keeping the sleep brief, but it does not establish one ideal duration for everyone.

In a 2006 laboratory study of 24 healthy young adults, researchers compared no nap with exactly 5, 10, 20 and 30 minutes of sleep. Participants had slept about five hours the previous night, and naps took place at 3 p.m.

• 5 minutes: Few benefits compared with no nap.
• 10 minutes: Immediate improvements in sleepiness, fatigue and cognitive performance; some benefits lasted up to 155 minutes.
• 20 minutes: Benefits emerged 35 minutes after waking.
• 30 minutes: Alertness and performance initially worsened before improving.

The 10-minute nap worked best overall in that study. Its small, sleep-restricted sample does not prove that 10 minutes is always better than 20.

Also, the researchers measured time asleep, not simply time spent lying down. A 20-minute alarm does not guarantee 20 minutes of sleep. For help budgeting time to drift off, see how long to power nap.

How to take one without disrupting your night

For a conventional daytime schedule:

1. Choose the early afternoon. Mayo Clinic advises that naps after 3 p.m. can interfere with nighttime sleep; your sleep schedule also matters.
2. Use a quiet, dark, comfortable space and set an alarm. Keep the nap brief rather than allowing it to become a long daytime sleep.
3. Allow time to wake up. Do not assume you will be ready immediately for driving or another task requiring sharp reactions.

Mayo Clinic recommends a restful setting and time to wake up before tasks requiring quick responses. Calling a nap “light” does not guarantee a grogginess-free awakening.

When a catnap is not the right fix

If you already struggle to fall asleep or stay asleep at night, napping may worsen the problem. Shorten or skip naps if you notice that pattern. If you suddenly need more naps than usual—or remain sleepy after waking in the morning—talk with a healthcare professional rather than only adjusting your nap timer. Mayo Clinic notes that medicines, sleep disorders or other health conditions may contribute.