To take a short nap is an art in itself. Depending on what you need to do right after you wake up, it determines the lenght of your nap. A really interesting read!
"Naps are actually more complicated than we realize," said David Dinges, a sleep scientist at the University of Pennsylvania's Perelman School of Medicine. "You have to be deliberative about when you're going to nap, how long you're going to nap and if you're trying to use the nap relative to work or what you have coming up."
Update: You might have to do a Google search to read the full article.
Featured image: Cropped graphics with illustrations by Remie Geoffroi.
Via @Zhaams.