Here is the link to a Talk of the Nation segment about napping at work. There's quite a bit of evidence that our bodies work better when given the opportunity to rest/nap in the afternoon; however, would any of us really feel comfortable w/our boss walking in on us while napping? Or, if you are the boss, would you feel an employee was slacking if you caught him/her napping on the job? Maybe catnaps (i.e. 30 min or less) in the afternoon should become more engrained into our overworked American culture...I actually think this might improve productivity in the workplace...

http://www.npr.org/templates/story/story.php?storyId=11361685