I'm aware of the benefits of napping but I never take a nap or even doze away during the day. If I close my eyes while sitting on the couch I know I'm going to sleep for hours.
The Art of Manliness has an article about how some of history's famous men incorporated the nap into their daily routines. Here's a look at the napping habits of 8 eminent men. (via Nag on the Lake)The Presurfer