FOXNews.com - Science News - Sleep Deprivation: The Great American Myth
"A six-year study Kripke headed up of more than a million adults ages 30 to 102 showed that people who get only 6 to 7 hours a night have a lower death rate than those who get 8 hours of sleep."
"The Cancer Prevention Study II even showed that people with serious insomnia or who only get 3.5 hours of sleep per night live longer than people who get more than 7.5 hours."