He woke up in a body that wasn't his, in a world that had passed him by.

This book is a fascinating deep dive into the science of sleep -- why we need sleep, how sleep (or the lack thereof) affects our health, and how to get better sleep. Matthew Walker distills fairly complicated and robust scientific concepts into prose that's easily digestible for a lay audience. Highly recommended -- the world would be a better place if everyone read this book and placed greater value on sleep.