Healthy sleep has been empirically proven to be the single most important determinant in predicting longevity, more influential than diet, exercise, or heredity, but our modern culture has become a virtual study in sleep deprivation. A world without darkness wreaks havoc on our body clocks. Sleep is sacrificed to meet the demands of our endless days. Doctors regard sleep deprivation as a fact of life and do little to promote sleep health or awareness. Meanwhile, the physical, emotional, and psychological costs of unhealthy sleep continue to mount.In "The Promise of Sleep", world-renowned sleep authority William C. Dement offers a definitive guide providing the information necessary to reap the benefits of a good night's sleep. Drawing on decades of experience, Dr. Dement explains what happens when we sleep, taking us on a fascinating tour of the sleeping body and mind. Exploring sleep's surpassingly powerful effect on overall health, from the immune system to psychological well-being, readers will learn the many ways that sleep loss and deprivation can put them in harm's way, inhibiting motivation, creativity, and vitality.Imparting wisdom gained through years of sleep lab experience, Dr. Dement reveals the seven principles of healthy sleep, and gives hands-on advice on such popular topics as sleep disorders and their cures, the role of prescription and over-the-counter sleeping aids, recovery from jet lag, the power of naps, and more. With "The Promise