Why We Sleep: Unlocking the Power of Sleep and Dreams

by Matthew Walker

Why We Sleep is a bestselling book about the vital importance of sleep to human functioning. It’s by sleep scientist Matthew Walker, Professor of Neuroscience and Psychology at the University of California, Berkeley, and Founder and Director of its Center for Human Sleep Science. We neglect the importance of sleep at our peril, he warns: “relative to the recommended seven to nine hours, the shorter your sleep, the shorter your life span.”