*Why We Sleep: Unlocking the Power of Sleep and Dreams* is a book by **Matthew Walker**, published in 2017.

The book delves into the science of sleep and its critical role in overall health and well-being. Walker, a sleep researcher, explains how sleep affects various aspects of our lives, including memory, emotional regulation, and physical health. He covers the mechanisms of sleep, the consequences of sleep deprivation, and practical advice for improving sleep quality. *Why We Sleep* aims to increase awareness about the importance of sleep and offers insights into how better sleep can enhance our lives.