This is an independent summary & analysis of Why We Sleep by Matthew Walker. It is not the original book. All trademarks and copyrights belong to their respective owners. For the full experience, please support the original work.

You're not tired because you're weak-you're tired because your brain is running on half-charge. This 15-minute summary of Why We Sleep reveals how sleep is the most powerful, underrated performance tool you have. The author explains what really happens in your brain at night: how deep sleep secures your memories, how REM sleep repairs your emotions, and how cutting sleep quietly destroys focus, creativity, immune function, and long-term health.