Sleep & wake-up
Ideal nap length
Enter how much time you have free and get a nap length that is less likely to leave you groggy.
Short 10–20 minute naps refresh you without grogginess. Only nap the full 90 minutes if you have a complete cycle to spare.
Why nap length matters
A nap feels restorative or ruining depending on where in the sleep cycle you wake. Wake in light sleep and you usually feel sharp; wake mid deep sleep and you get sleep inertia, that heavy, foggy feeling that can last half an hour. The trick is to match the nap to the time you actually have, so you are more likely to either stay in light sleep or finish a full cycle.
| Nap length | What you get |
|---|---|
| 10 minutes | Quick alertness boost, usually little grogginess |
| 20 minutes | The classic power nap, good for focus and mood |
| 30 minutes | Slight risk of waking groggy |
| 90 minutes | About one full cycle, including deep and dream sleep |
Getting the most from a nap
Nap early rather than late. A nap in the first half of the afternoon rides your natural post-lunch dip and is far less likely to steal from your night sleep than one close to evening. Find a dark, cool spot, set an alarm for the length suggested above, and give yourself a few extra minutes to fall asleep. If you struggle to drop off within that window, treat the time as quiet rest instead; lying still with your eyes closed still lowers arousal and helps you reset before the rest of the day.
Frequently asked questions
Is a 20-minute or 90-minute nap better?
It depends on your time. A 20-minute nap sharpens focus without grogginess and fits a short break. A 90-minute nap usually completes about one full cycle and aids memory, but needs a bigger gap in your day.
Why do I wake up groggy after a nap?
You most likely woke during deep sleep, which usually starts around 30 minutes in. Keep naps to 20 minutes or extend to a full 90-minute cycle so you are more likely to wake in lighter sleep.
When is the best time to nap?
Early afternoon works best for most people, lining up with the natural dip in alertness after lunch. Napping late in the day can make it harder to fall asleep at night.