The Promise of SleepBy: William C. Dement Sleep better, live longer with the groundbreaking information and step by step program in this revolutionary book. Healthful sleep has been empirically proven to be the single most important factor in predicting longevity, more influential than diet, exercise, or heredity. And yet we are a sleep sick society, ignorant of the facts of sleep and the price of sleep deprivation. In this groundbreaking book, based on decades of study