Are Naps Good or Bad? The Answer Depends on How You Nap

Why does a short nap make you feel more alert?

Your drive to sleep builds throughout the day through a process called sleep pressure — the gradual accumulation of adenosine in the brain. A short nap partially clears that buildup, which is why you feel more alert afterward 1Ref 1Watson NF, Badr MS, Belenky G, et al. (2015).Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society.Adults need at least 7 hours of sleep per night; chronic short sleep accumulates as a sleep debt.

The catch: sleep pressure is also what drives you into a solid night of sleep. A nap that is too long or too late in the day can reduce that pressure enough that you lie awake at night, waiting for a signal that has already been spent.

Most people also experience a natural dip in alertness between roughly 1 and 3 pm — a biological window when a brief nap is least disruptive to your nighttime sleep.

What is the best nap length?

Sleep specialists generally recommend staying in the 10 to 20 minute range for a daytime nap 1Ref 1Watson NF, Badr MS, Belenky G, et al. (2015).Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society.Adults need at least 7 hours of sleep per night; chronic short sleep accumulates as a sleep debt. Here is why:

• 10 to 20 minutes: Clears enough sleep pressure to restore alertness; you wake before entering deep (slow-wave) sleep, so grogginess on waking is minimal.
• 30 to 60 minutes: Risk of waking from deep sleep rises sharply — this produces "sleep inertia," a period of pronounced grogginess that can last 20 to 30 minutes.
• About 90 minutes: Completes a full sleep cycle and can be more restorative, but carries greater risk of reducing nighttime sleep pressure, especially in people who tend toward insomnia.

A "nappuccino" — drinking coffee just before a 20-minute nap so the caffeine activates as you wake — is a physiologically sound strategy that many shift workers and researchers have found useful.

Who should be cautious about napping?

Napping is not universally beneficial. A few groups should approach it carefully:

People being treated for insomnia. Cognitive Behavioral Therapy for Insomnia (CBT-I) — the recommended first-line treatment for chronic insomnia — deliberately restricts time in bed to maximize nighttime sleep pressure 2Ref 2Edinger JD, Arnedt JT, Bertisch SM, et al. (2021).Behavioral and Psychological Treatments for Chronic Insomnia Disorder in Adults: An American Academy of Sleep Medicine Clinical Practice Guideline.CBT-I uses sleep restriction to build nighttime sleep pressure; daytime napping undermines this mechanism. Daytime napping works against this mechanism and can undercut the treatment. If you are in CBT-I, discuss napping explicitly with your clinician.

People with depression. A strong urge to sleep or withdraw during the day is a common symptom of depression, not merely tiredness. Frequent napping in this context can reinforce low nighttime sleep pressure and worsen the cycle.

Shift workers and people with jet lag. Strategic napping can help, but the optimal timing is complex. A sleep specialist can provide tailored guidance.

Adolescents. Their biological clock already runs late. Afternoon napping can further delay sleep onset at night, compounding an existing sleep debt rather than relieving it.

What does frequent or long napping signal?

Needing long or frequent naps to function is not simply a personality trait. It can reflect:

• Poor nighttime sleep quality — from obstructive sleep apnea (OSA), insomnia, or restless legs syndrome. OSA in particular causes dozens or hundreds of brief arousals per night that are not consciously remembered, leaving the person feeling unrefreshed every morning 3Ref 3Kapur VK, Auckley DH, Chowdhuri S, et al. (2017).Clinical Practice Guideline for Diagnostic Testing for Adult Obstructive Sleep Apnea: An American Academy of Sleep Medicine Clinical Practice Guideline.OSA causes repeated nocturnal arousals that fragment sleep and leave patients unrefreshed, driving daytime sleepiness.
• Insufficient total sleep — the most common and most overlooked cause. Adults need at least 7 hours per night for optimal health; chronic short sleep accumulates as a debt that napping can only partially offset 1Ref 1Watson NF, Badr MS, Belenky G, et al. (2015).Recommended Amount of Sleep for a Healthy Adult: A Joint Consensus Statement of the American Academy of Sleep Medicine and Sleep Research Society.Adults need at least 7 hours of sleep per night; chronic short sleep accumulates as a sleep debt.
• Medical conditions — anemia, thyroid dysfunction, and chronic illness can all drive persistent fatigue.
• Mood disorders — depression and anxiety are among the most common drivers of daytime fatigue and unrefreshing sleep.

If you nap more than an hour most days and still feel tired after sleeping at night, that pattern is worth discussing with a clinician rather than normalizing as "just who you are."

How does age change the picture?

Older adults naturally obtain less deep (slow-wave) sleep as they age, so sleep can feel lighter and less restorative 4Ref 4National Institute on Aging (2023).Sleep and Older Adults.Deep sleep naturally decreases with age, making sleep feel lighter; brief naps are generally fine but frequent long napping may signal an underlying condition. Brief naps are generally fine, but very frequent or long napping in older adults should prompt a check for underlying conditions such as OSA or depression — not simply be accepted as an aging inevitability.

Young children need structured naps as part of their total daily sleep requirement. Eliminating naps too early for toddlers is a common error.

Pregnancy — particularly the first trimester — brings increased fatigue that makes napping common and appropriate. Discomfort in the second and third trimesters also disrupts nighttime sleep, making daytime rest more necessary.