There's a gym in England that just created a new workout called "Napercise." You go to the gym, head into one of the class studios . . . and then everyone takes a 45-minute nap. You also do some stretches before or after, but I bet those are optional.
The gym says the class, quote, "reinvigorates the mind, improves moods, and even burns the odd calorie."
(And if you want some tips on how to achieve the perfect nap, check out this guide.)