Nap Your Way to the Top: "The evidence is overwhelming: Napping on the job is great for you and great for your boss. A power nap of about 20 minutes has been proven to increase alertness and overall productivity in workers. Siestas also boost mood. 'Remember when your mother told you to take a nap because you were cranky? She was right,' says William Anthony, who co-authored The Art of Napping at Work with his wife Camille."