Dr. Walker is the author of the International Bestseller, Why We Sleep. It has a singular goal: to reunite humanity with sleep.

The book provides a complete description of, and prescription for, sleep. It answers critical questions about sleep: how do caffeine and alcohol affect sleep? What really happens during dreaming? Why do our sleep patterns change across a lifetime? How do common sleep pills affect us and can they do long-term damage?

Charting cutting-edge scientific breakthroughs, and synthesizing decades of research and clinical practice, Why We Sleep explains how we can harness sleep to improve learning, mood, and energy levels; regulate hormones; prevent cancer, Alzheimer’s, obesity and diabetes; slow the effects of aging; increase longevity; enhance the education and lifespan of our children; and boost the efficiency, success, and productivity of our businesses.