http://ririanproject.com/2007/09/05/10-benefits-of-power-napping-and-how-to-do-it
10 Benefits of Power Napping, and How to Do It
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How Long Is A Good Nap?
# THE NANO-NAP: 10 to 20 seconds. Sleep studies haven’t yet concluded whether there are benefits to these brief intervals, like when you nod off on someone’s shoulder on the train.
# THE MICRO-NAP: two to five minutes. Shown to be surprisingly effective at shedding sleepiness.
# THE MINI-NAP: five to 20 minutes. Increases alertness, stamina, motor learning, and motor performance.
# THE ORIGINAL POWER NAP: 20 minutes. Includes the benefits of the micro and the mini, but additionally improves muscle memory and clears the brain of useless built-up information, which helps with long-term memory (remembering facts, events, and names).
# THE LAZY MAN’S NAP: 50 to 90 minutes. Includes slow-wave plus REM sleep; good for improving perceptual processing; also when the system is flooded with human growth hormone, great for repairing bones and muscles.
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Always seemed like a smart idea. But not in an american workplace.
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Reinke Faces Life 