This book explains from a scientific point of view the reasons for why we sleep. Neuroscientist and sleep researcher Matthew Walker is a professor of neuroscience and Psychology and the director of the Center of Human Sleep Science at the University of California, Berkeley. He spent 4 years writing the book as part of his PhD in which he highlights some interesting links between sleep deprivation and numerous physical and mental diseases like dementia. The book became an international bestseller, including a #1 Sunday Times Bestseller in the UK, and a New York Times Bestseller. It’s a great piece if you’re interested in getting more detail about an everyday-life habit we not always pay enough attention to.