Before I read this post I used to think 6 hours sleep is good for an average person but after reading this post How Little Sleep Can You Get Away With? is based on research by David Dinges, the head of the Sleep and Chronobiology Laboratory at the Hospital at University of Pennsylvania, who has the distinction of depriving more people of sleep than perhaps anyone in the world I changed my opinion .
In other words, the sleep-deprived among us are lousy judges of our own sleep needs. We are not nearly as sharp as we think we are.
Via NYT How Little Sleep Can You Get Away With?