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Review ------ A neuroscientist shows how a good night's shut-eye can make us cleverer, more attractive, slimmer, happier, ier and ward off cancer . . . it's probably a little too soon to tell you that it saved my life, but it's been an eye-opener (Mark O'Connell Guardian) Passionate, urgent . . . it had a powerful effect on me (Rachel Cooke Observer) Compelling and utterly convincing . . . you'll never think of your bedtime in the same way again (James McConnachie The Sunday Times) A stimulating and important book . . . richly packed with science (Clive Cookson Financial Times) Uplifting . . . Walker is in love with and wants us to fall in love with , too (David Kamp The New York Times) Matthew Walker is probably one of the most influential people on the planet (Katie Law Evening Standard) Astonishing ... an amazing book ... absolutely chocker full of things that we need to know (Chris Evans) 'Amazing . . . I'm obsessed with this book' From the Inside Flap -------------------- is one of the most important aspects of our life, and longevity and yet it is increasingly neglected in twenty-first-century society, with devastating consequences: every major disease in the developed world - Alzheimer's, cancer, obesity, es - has very strong causal links to deficient . Until very recently, science had no answer to the question of why we , or what good it served, or why its absence is so damaging to our . Compared to the other basic drives in life - eating, drinking, and reproducing - the purpose of remained elusive. Now, in this book, the first of its kind written by a scientific expert, Professor Matthew Walker explores twenty years of cutting-edge research to solve the mystery of why matters. Looking at creatures from across the animal kingdom as well as major human studies, Why We delves in to everything from what really happens during REM to how caffeine and alcohol affect and why our patterns change across a lifetime, transforming our appreciation of the extraordinary phenomenon that safeguards our existence.