RESEARCH
The research behind the coffee nap
The coffee nap isn't a life hack someone made up. It comes from a handful of sleep studies: first on sleepy drivers, then on the afternoon slump. Here is what each one tested and found, in plain language.
1996 · Driving simulator
A nap or a coffee for sleepy drivers?
A short nap and 150 mg of caffeine each cut driving mistakes and sleepiness for an hour. Just taking a break did nothing.
Read more →1997 · Driving simulator
Coffee plus a short nap beat coffee alone
Combined, they cut driving incidents to 9% of the placebo level, against 34% with caffeine alone. Even light dozing counted.
Read more →2003 · Afternoon slump
The best way to wake up from an afternoon nap
Caffeine before a 20-minute nap worked better than bright light or washing your face afterwards, for a full hour.
Read more →2013 · Night sleep
Why the coffee nap belongs in the early afternoon
Caffeine taken even 6 hours before bed cut night sleep by more than an hour, and people didn't notice.
Read more →These were small studies with healthy adults, mostly in a lab or simulator. They point the same way, but they are not a guarantee for everyone. This page is general information, not medical advice.