Every now and then I could use a nap... except it's particularly difficult for me to fall asleep unless I am very tired. Daniel Tenner has an excellent article over at lifehacker on napping. Napping is now sleeping, according to Daniel, "To get the benefit of a refreshing power nap, you don't need to fall asleep. It's enough to relax yourself and let your thoughts drift off, even while remaining mostly awake. If you can do this properly (it does take some practice), you can power nap even if you find it impossible to fall asleep quickly."
Read the full article.