The BBC Magazine:
“A 20-minute nap gives you an amazing boost, it’s much better than having a coffee,” says Dr Stanley. “Even closing your eyes for 20 minutes is better than nothing. “But in the UK it is culturally unacceptable for us to be found napping with our head on the keyboard. However, it’s fine to pump yourself with caffeine even though it it’s nowhere near as effective.”
I used to power nap twice a day — around 30 minutes a time to keep me going during a long work day. It did eventually get to me though, and after a year of power napping twice a day and living on five hours of real sleep, I was very jaded.
The culture does need to change in the UK and US, pumping up on caffeine and working long hours is sometimes just not productive.