1. Work backwards from your next commitment
Write down when your break must end. If you are free from 14:00 to 14:30, you have 30 minutes in total. That is the available window, not automatically the timer setting.
A simple planning rule is: settling-in time + nap countdown + time afterwards = the whole break. Include any walk to your rest spot separately. Choosing a shorter timer can be more comfortable than using every available minute and then hurrying back.
2. Pick a countdown that fits
How long should the countdown be? In a study by Brooks and Lack, an afternoon nap with 10 minutes of sleep improved alertness immediately, while a 20-minute nap took about 35 minutes to show its benefit and a 30-minute nap was followed by a short period of grogginess. [1] For a quick boost before getting back to work, 10–20 minutes is a sensible starting point.
In Nap & Recharge, choose a nap preset from the Naps screen. The example below shows options including 10, 15 and 20 minutes. Pick by the time available; the preset name does not guarantee an outcome.
For more on choosing a length, see the nap-duration guide.
3. Add the Sleep Buffer only once
Most nap studies count minutes of actual sleep, but your timer counts from the moment you start it. The Sleep Buffer is a fixed delay before the nap countdown, so the first minutes of settling in do not eat into your nap. A three-minute buffer plus a 15-minute timer means the alarm sounds after 18 minutes. The app does not detect when you fall asleep.
Starting at 14:00 in this example gives an alarm at 14:18 and 12 minutes before a 14:30 commitment. With a 20-minute timer and the same buffer, the alarm would be at 14:23. Choose the combination that leaves an unhurried return.
4. Leave time to wake up
Right after waking, many people feel groggy for a while. This sleep inertia is usually stronger after longer naps, after short nights and at night. [3] Even naps of 30 minutes or less do not reliably avoid it, according to a 2017 review. [2]
So plan at least a few minutes after the alarm before anything demanding. After a longer nap, or if you slept badly the night before, plan more. Read more about sleep inertia.
5. Choose and check your wake-up settings
Set a wake-up sound and, if you like, vibration. The Routine screen illustration shows separate controls for Wake Up Sound, Vibration and Ambient Sound. Background audio and your wake-up alarm serve different purposes.
Before relying on a new setup, test the alarm on your own phone. Use the same speaker or headphones you intend to use for the break, and check any alarm permissions requested by Android.
Three example plans
| Available time | Buffer | Countdown | Time to wake up |
|---|---|---|---|
| 20 minutes | 3 min | 10 min | 7 min |
| 30 minutes | 3 min | 15–20 min | 7–12 min |
| 45 minutes | 5 min | 20–26 min | 14–20 min |
Scroll the table sideways on small screens.
These are planning examples, not tested formulas. Adjust them to how quickly you usually fall asleep and how you feel afterwards.
A short checklist before you press start
- Does the buffer plus countdown fit inside the available break?
- Have you left time after the alarm?
- Is the resting position comfortable and the phone safely placed?
- Have you checked the sound and vibration you want to use?
Then let the timer run without repeatedly checking whether you have fallen asleep. If settling down is the difficult part, try the nap preparation guide.
Common timer questions
Does a 20-minute timer mean 20 minutes asleep?
No. The countdown also runs while you are awake. In studies, the minutes counted were minutes of sleep. [1]
Must I buy Pro to take a short nap?
No. Nap & Recharge has a free version. Pro is an optional one-time upgrade for additional features; the feature comparison explains the differences.
Can I use a normal alarm instead?
Yes. Calculate your intended wake-up time directly. The app adds convenient presets and settings, not a requirement for taking a break.