"Why We Sleep" by Matthew Walker, a neuroscientist and sleep expert, is one of the most important recent books that addresses the topic of sleep from a simple and engaging scientific perspective. First published in 2017, the book has gained widespread acclaim for its profound content and easy-to-understand style. About the Book: 1. The Importance of Sleep for Physical and Mental Health: Walker explains that sleep is not a luxury, but a biological necessity. Sleep affects nearly everything: memory, the immune system, hormonal balance, mood, and even the risk of chronic diseases such as Alzheimer's, diabetes, and heart disease. 2. The Stages of Sleep and Their Functions: The book details the stages of sleep (such as REM sleep and NREM sleep) and how each contributes to the maintenance of the brain and body. 3. The Effects of Lack of Sleep: Walker explores the negative effects of lack of sleep, such as decreased mental performance, deterioration of general health, and an increased risk of accidents and psychological problems. 4. Sleep and Modern Society: The author criticizes modern lifestyles that devalue sleep, such as work stress, constant exposure to artificial light, and the use of electronic devices before bedtime. 5. Practical Tips for Improving Sleep: The book offers simple guidelines for improving sleep quality, such as maintaining a regular sleep routine, reducing caffeine, and avoiding screens before bedtime. What Makes the Book Unique: Simple and engaging language despite its scientific subject matter. Supported by recent scientific research and studies. An explicit call to change our view of sleep as essential, not a luxury. Overall Rating: The book is an important reference for understanding sleep from a scientific and human perspective. It is a clear call to reconsider our lifestyle and achieve a better balance by respecting our biological need for sleep.