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Re:Lack of sleep 'raises cold risk' by bd on Tuesday January 13, 2009 @04:10PM (#432705)
I remember awesome Google Tech Talk about sleep that mentioned sleep debt requiring full repayment.

Dr. William Dement on "Healthy Sleep and Optimal Perfomance"

http://www.youtube.com/watch?v=8hAw1z8GdE8

It was linked from an older HN sleep thread:

http://news.ycombinator.com/item?id=359041

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