Deadly Consequences

Matthew Walker explains how insufficient sleep is linked to every disease that is killing us in the developed world, including cancer and Alzheimer's disease. The number of people who can survive on five hours of sleep or less without showing any impairment is zero, and even those who think they can survive on insufficient sleep are at risk of chronic and acute health problems. The link between a lack of sleep and cancer is so strong that the World Health Organization has classified any form of nighttime shift work as a probable carcinogen.