How to Nap

I've discovered naps! (when I told this to a female friend she rolled her
eyes and said, "every man I know says that at some point. What is it with
men and napping?") When my head is drooping down to the keyboard, instead
of forcing myself to go on I have a nap on our great lab minicouch,
and leap up 20 minutes later as my watch alarm goes off, totally
refreshed.
It's all thanks to these tips my man Jim sent, source
http://longevity.about.com/od/sleep/a/napping_tips.htm

* Nap Time: Prime nap time is from 1:00 p.m. to 3:00 p.m., when your
energy level dips due to a rise in the hormone melatonin at that time of
day.
* Darkness: Use a face mask or eye pillow to provide daytime darkness and
make your nap more effective.
* Not Too Late: Napping within three hours of bedtime may interfere with
nighttime sleep.
* Quiet Place: Assure that you will not be disturbed for the duration
of your nap.
* 30-Minute Maximum: When taking a nap longer than 30 minutes, you run the
risk of heading into deep sleep, which will leave you feeling tired and
groggy. Naps as short as 1 to 2 minutes could be effective for some
people.
* Set an Alarm: You will eventually train yourself to nap for the
amount of time you set aside. Until then, set an alarm or ask someone to
wake you up.
* The Caffeine Nap: Some people claim that drinking coffee and then taking
an immediate nap works well. The caffeine kicks in somewhere between 10
and 20 minutes, waking them up. They feel extra energy from both the nap
and the coffee. Researchers in Japan found that subjects using a caffeine
nap rated highest in decreased sleepiness and increased productivity when
compared to subjects taking a nap and washing their face, or taking a nap
and being exposed to bright lights.

One more thing I like about naps: as my conscious mind releases, I often
have bizarre, dream-like thoughts, which I love - it's a surreal break in
the middle of a mundane day, like an episode of The Office had a few
minutes of Yellow Submarine spliced into it.