Informant38

The Nando Times: Sleep less and live longer, large study says The best survival rates were found among those who slept seven hours per night. The study showed that members of a group sleeping eight hours were 12 percent more likely to die within a six-year period than those sleeping seven hours, all other factors being equal.
But even those sleeping as little as five hours a night lived longer than participants who got eight or more hours a night.