I read this book in 2019. In light of the recent publish of its Chinese version, I thought I could share some of my reading notes. The ultimate purpose of the book is to emphasize the vital importance of sleep. Through countless examples and theories, the author hopes that the realization of “sleep matters so much” may finally lead people to a more healthy life. I’ve been constantly monitoring my own sleep status ever since and can personally vouch that my overall health and skin quality is in great shape with a simple combination of ample time of sleep and abundant water intake.