Power Naps: How Long to Nap and When
A well-timed nap can boost alertness, but a poorly timed one can leave you groggier than before. Length and timing make the difference.
By the Sleep Calculator team at Digimarket Group SIA · Updated 4 November 2026
Nap lengths compared
| Length | What to expect |
|---|---|
| 10–20 minutes | The classic power nap. Mostly light sleep, so you wake easily with improved alertness. |
| 30–60 minutes | Higher chance of waking from deep sleep and feeling groggy for a while, though memory benefits may follow. |
| ~90 minutes | Roughly a full cycle including REM; waking at the end often feels better than at 45 minutes. Can affect night sleep. |
Best time to nap
For most people the natural afternoon dip falls between about 13:00 and 15:00. Napping then fits your body clock. Napping in the late afternoon or evening makes it harder to fall asleep at night.
How to take a power nap
- Set an alarm for 20–25 minutes (allowing a few minutes to fall asleep).
- Find somewhere dim and quiet; an eye mask helps.
- Even if you do not fall fully asleep, resting quietly still helps.
- When the alarm rings, get up, get light and move for a minute.
The “coffee nap”
Some people drink a coffee immediately before a 15–20 minute nap. Caffeine takes about 20 minutes to take effect, so it starts working as you wake. It is useful before a drive or afternoon shift, but avoid it later in the day.
Who should be careful with naps
- People with insomnia — naps can reduce sleep pressure at night.
- Anyone needing frequent long naps despite enough night sleep — that can signal a sleep disorder worth discussing with a doctor.
Drowsy driving
If you feel sleepy while driving, stop somewhere safe and take a short nap. Opening a window or turning up the radio does not reliably prevent micro-sleeps.