Quick answer: A coffee nap means drinking coffee and then immediately taking a nap of about 15–20 minutes, so you wake as the caffeine kicks in. It does work in studies: in a 2003 study, 200 mg of caffeine followed by a 20-minute nap beat a nap alone for afternoon sleepiness and performance. Take it at least 6 hours before bedtime.
The mid-afternoon slump hits most of us after lunch. Another coffee helps a bit, and a nap helps a bit, but combining them in the right order works better than either.
In this guide 7 sections
How does a coffee nap work?
Caffeine keeps you alert by blocking adenosine, a brain chemical that builds up while you are awake and makes you sleepy. A short sleep lowers that sleep pressure. The idea of a coffee nap is to get both at once: you drink the coffee, sleep while the caffeine is still being absorbed, and wake up rested just as it starts working.
Caffeine isn’t instant. It is absorbed over roughly the first 45 minutes, and in one study blood levels peaked about 30 minutes after a dose, according to a 2025 FSANZ safety review. That gap is your window for a nap.
Do coffee naps really work?
The research is small but consistent:
- In a 2003 study of 10 young adults, 200 mg of caffeine followed by a 20-minute nap was the most effective option tested against mid-afternoon sleepiness, beating a nap alone, and the effect lasted the full hour after waking.
- In a 1997 study of 12 sleepy drivers in a simulator, 200 mg of caffeine plus a nap of under 15 minutes cut driving incidents to 9% of placebo levels, compared with 34% for caffeine alone. Even “naps” where people only dozed still helped.
- In a 1994 study on staying alert through a night without sleep, a long nap beforehand plus caffeine kept performance at baseline levels.
These were controlled lab studies with pure caffeine doses, but they support the basic idea.
How to take a coffee nap
- Drink about 200 mg of caffeine fairly quickly. That is roughly two 8 oz cups of brewed coffee (about 95 mg each, per USDA) or a triple shot of espresso (about 63 mg per shot). If you’re sensitive to caffeine, use less.
- Set an alarm for 15–20 minutes. I like using the Alarmy app on my iPhone and selecting the Power Nap option for 20 minutes.
- Lie down straight away. You want to be asleep or at least resting before the caffeine starts working.
- Get up when the alarm goes. Napping longer risks sliding into deeper sleep and waking groggy.
Don’t worry if you don’t fall fully asleep. Resting with your eyes closed still counts for something, and in the 1997 study light dozing was still effective.
When should you take a coffee nap?
Early to mid-afternoon is ideal, which is when the 2003 study took its naps. Keep it at least 6 hours before bedtime: a sleep study found caffeine taken 6 hours before bed still disrupted sleep. See how long coffee stays in your system for more on timing.
Who are coffee naps good for?
Coffee naps suit people who can nod off fairly easily. If you aren’t a natural napper, the pressure to fall asleep in 20 minutes can make it harder. They may also work less well if you already drink coffee all day, since you’ll have more caffeine on board and more tolerance to it. And they are a short-term fix: if you’re sleepy every afternoon, look at your night-time sleep first.
Students cramming for exams can use the same trick; see does coffee help you study?
Frequently asked questions
How long should a coffee nap be?
About 15–20 minutes. The studies used naps of under 15 minutes and 20 minutes. Longer naps raise the chance of waking groggy.
How much coffee should I drink for a coffee nap?
The studies used 200 mg of caffeine, roughly two cups of brewed coffee. Less may be enough if you rarely drink coffee.
Can I take a coffee nap with tea or an energy drink?
The caffeine is what matters, so any drink works if you get a similar dose quickly. Check the label: tea has much less caffeine than coffee, about 14–60 mg per 8 oz cup according to MedlinePlus.
Scientific sources for coffee naps
- Suppression of sleepiness in drivers: combination of caffeine with a short nap.
- The alerting effects of caffeine, bright light and face washing after a short daytime nap.
- The use of prophylactic naps and caffeine to maintain performance during a continuous operation.
- Counteracting driver sleepiness: Effects of napping, caffeine, and placebo
For the bigger picture on coffee and health, see is coffee good for you?
This article is for general information and isn’t medical advice.