Collects good information on the impact of sleep (and the effects of deprivation) on the brain and body. Can be a little pop-science or preachy at times; this is the author's first (and only) book. See the appendix for tips on how to get a good night's sleep.

The first chapter is really an extended introduction, and makes a lot of claims with no evidence. The evidence (quite a bit of it) shows up later in the book, and seems fairly compelling. The author does go over the top into zealotry on this topic at times. This book is certainly worth reading, but the style of writing knocked the rating down a notch for me. Recommended regardless.