Until recently, science did not have a complete understanding of the mechanisms of sleep, all the diversity of its beneficial effects and why the consequences of chronic lack of sleep are detrimental to health. Prominent neurologist and scientist Matthew Walker summarizes the latest research on the phenomenon of sleep and invites conversation on topics related to one of the most important aspects of our existence. “Sleep is the single most effective action we can take to regulate the functioning of our brain every day and bodies. This is Mother Nature's best weapon in confronting death. Unfortunately, the real evidence explaining all the dangers that people and society are exposed to in case of lack of sleep has not yet been fully communicated to people. This is the most glaring omission in today's health conversation. This is precisely what my book is designed to correct, and I really hope that it will turn into an exciting journey full of discoveries for the reader. In addition, the book aims to reassess the assessment of sleep and change the disdainful attitude towards it.” (Matthew Walker)