Why We Sleep is a groundbreaking exploration of sleep, examining how it affects every aspect of our physical and mental well-being. Neuroscientist and sleep expert Matthew Walker charts the most cutting-edge scientific breakthroughs and, with his decades of research and clinical practice, provides actionable steps towards getting a better night's sleep.

Walker explains how we can harness sleep to improve learning, mood, and energy levels; regulate hormones; prevent cancer, Alzheimer's, and diabetes; slow the effects of aging; and increase longevity. He also delves into the importance of dreaming, how caffeine and alcohol affect sleep, and why our sleep patterns change across a lifetime.

The book is a revolutionary exploration of the vital importance of sleep, transforming our appreciation of the extraordinary phenomenon that safeguards our existence.