THE NAPPUCCINO GUIDE
What is a coffee nap?
A coffee nap, or nappuccino, is a short nap taken right after a cup of coffee. Caffeine needs about 20 minutes to kick in, so you sleep while it's on its way and wake up just as it starts working. In studies, the combination beat coffee alone and a nap alone.
In short
- Drink a cup of coffee quickly, about 100–200 mg of caffeine.
- Lie down straight away and close your eyes.
- Nap 15–20 minutes, not longer, so you wake before deep sleep.
- Get up when the alarm goes. The caffeine is arriving now.
- Best in the early afternoon, and at least 6 hours before bedtime.
THE EASIEST WAY TO TAKE ONE
Nappuccino for Apple Watch
Drink your coffee, tap Coffee nap on your Watch and lie down. A gentle alarm wakes you right on time, as the caffeine kicks in. On caffeine-free days it times power naps from the moment you actually fall asleep.
Why it works
During the day a chemical called adenosine builds up in the brain and makes you feel sleepy. Caffeine works by blocking adenosine from docking onto its receptors. Sleep, even a short one, is thought to lower adenosine levels.
A coffee nap uses both at once. The nap clears away some of the sleepiness, and by the time you wake up, caffeine has reached your brain and blocks much of what is left. Keeping the nap short matters too: after about 20–30 minutes you are more likely to slip into deep sleep, and waking from deep sleep leaves you groggy (sleep inertia), which is the opposite of what you want.
What the research says
Sleepy drivers, 1996
In a driving simulator, both a nap of under 15 minutes and 150 mg of caffeine reduced driving mistakes and sleepiness for the following hour, each on its own.
Caffeine plus a nap, 1997
Sleepy drivers had 200 mg of caffeine followed by a nap of under 15 minutes. Driving incidents fell to 9% of the placebo level, against 34% with caffeine alone. Even people who only dozed without really falling asleep benefited.
Afternoon slump, 2003
Researchers compared a 20-minute nap on its own with a nap plus caffeine, bright light or face washing. 200 mg of caffeine before the nap worked best for both sleepiness and performance, for the full hour after waking.
These were small laboratory studies with healthy young adults, but their results point the same way, and they are why the coffee nap became a popular trick.
How to take a coffee nap
- Pick your moment. The natural dip in alertness after lunch, roughly 1–3 pm, is ideal. Avoid the late afternoon and evening: caffeine has a half-life of about 5 hours, and even 6 hours before bed it can cost you over an hour of night sleep.
- Drink it fast. A cup of brewed coffee or a double espresso, finished within a few minutes. Very hot coffee you have to sip slowly works against you; let it cool a little or have it iced.
- Lie down right away. Somewhere quiet and dim. A reclined chair is fine. Put your phone away.
- Set 15–20 minutes. Start the timer as soon as you lie down, not when you fall asleep: the caffeine clock started with your cup.
- Don't worry about sleeping. Light dozing still helps. Just rest with your eyes closed.
- Get up with the alarm. Stand up, get some daylight or splash water on your face, and go.
How much coffee?
The studies used 150–200 mg of caffeine. Caffeine varies a lot between drinks, so these are rough figures:
| Drink | Caffeine, about |
|---|---|
| Single espresso (30 ml / 1 fl oz) | 60–65 mg |
| Brewed coffee, 240 ml / 8 fl oz | 95 mg |
| Brewed coffee, 350 ml / 12 fl oz | 140 mg |
| Instant coffee, 240 ml / 8 fl oz | 60–80 mg |
One mug of brewed coffee or a double espresso is usually enough. For most healthy adults the U.S. FDA considers up to 400 mg a day unlikely to cause problems. Count your coffee nap in that total.
Coffee nap or regular power nap?
☕ Coffee nap
For when you need to be sharp right after waking: a meeting, a drive home, an afternoon of focused work. Use a fixed 15–20 minute timer from the moment you lie down.
🌙 Power nap
For real rest without caffeine, or later in the day when coffee would spoil your night. Count 10–25 minutes from when you actually fall asleep.
Who should skip it
- People who are sensitive to caffeine, or have heart rhythm problems, high blood pressure, anxiety or reflux made worse by coffee.
- Anyone pregnant, trying to get pregnant or breastfeeding, or taking medication that interacts with caffeine: ask your doctor first.
- Anyone using it to replace night sleep. A coffee nap is a short-term boost, not a cure for regular sleep loss.
If you feel sleepy while driving, pull over somewhere safe. A coffee and a short nap can help you get home, but they don't make driving while exhausted safe.
Coffee naps with Nappuccino
Nappuccino is a nap app for Apple Watch. Drink your coffee, tap Coffee nap on your Watch and lie down: the timer starts right away and a gentle alarm wakes you in time. Or just say “Start a coffee nap in Nappuccino” to Siri. On caffeine-free days, Detect sleep counts your nap from the moment you actually fall asleep and wakes you before deep sleep.
Questions
Why is it called a nappuccino?
It's a play on cappuccino: a nap and a coffee in one. Coffee nap and caffeine nap mean the same thing.
Does it work with tea, energy drinks or caffeine pills?
The effect comes from the caffeine, so any source can work as long as the amount is similar. Tea has less, roughly 30–50 mg a cup. Drinks are absorbed a little faster than pills. Sugary energy drinks add sugar you don't need.
How do I keep track of how much caffeine I've had?
Try Duo Coffee, our coffee and caffeine tracker for iPhone, made for iPhone Duo too. Log each cup with a tap and see your caffeine for the day against the 400 mg guideline, so you know whether there's room for a coffee nap.
Does decaf work?
No. Decaf has only a few milligrams of caffeine, so you just get a regular nap. In the 1996 study, decaffeinated coffee was the placebo.
What if I can't fall asleep in 20 minutes?
Get up anyway. Resting with your eyes closed still helps, and in the 1997 study even people who only dozed benefited. Staying in bed longer means the caffeine keeps you awake for nothing.
Why not nap for 30 minutes or longer?
The longer you sleep, the more likely you are to reach deep sleep. Waking from it makes you groggy for a while, which cancels out the point of a quick boost.
Sources
- Horne JA, Reyner LA. Counteracting driver sleepiness: effects of napping, caffeine, and placebo. Psychophysiology. 1996;33(3):306–309. PubMed
- Reyner LA, Horne JA. Suppression of sleepiness in drivers: combination of caffeine with a short nap. Psychophysiology. 1997;34(6):721–725. PubMed
- Hayashi M, Masuda A, Hori T. The alerting effects of caffeine, bright light and face washing after a short daytime nap. Clinical Neurophysiology. 2003;114(12):2268–2278. PubMed
- Drake C, Roehrs T, Shambroom J, Roth T. Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. Journal of Clinical Sleep Medicine. 2013;9(11):1195–1200. PMC
- U.S. Food and Drug Administration. Spilling the Beans: How Much Caffeine is Too Much? fda.gov
This page is general information, not medical advice. Last updated October 2026.