After I re-read that, I realized it might have been approached wth some incredulity, so I attached a few links to further explain:
http://en.wikipedia.org/wiki/Sleep_debt
http://www.sleepquest.com/d_column_archive6.html
http://www.sleepfoundation.org/hotto...secid=8&id=222
.. I could list more but searching google for "sleep debt" or "sleep need" should return a plethora of information. Sleep debt is linked to obesity too! 
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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