Agreed - I have a small couch in my office that I use for naps; Sometimes in the early afternoon, I lose motivation and hit the proverbial 'wall' - when this happens, I just set my cell phone alarm and nap for an hour.

I usually wake up alert and refreshed and try to make up for the lost time. As an aside, I once forgot to set my alarm and ended up sleeping for about 3 hours. My colleague thought I had left for the day :)

If I didn't get enough sleep the previous night and I have a sufficiently large lunch, then it would seem inevitable I would dose off :))) even if I'm in a meeting @_@