I ordered this book with an expectation to learn a lot about what function sleep serves, how it relates to cognition and physical performance, what we know about dreams and dreaming, and other key themes in an argument that affects every day (or more often night) of our lives.
My experience is that books dealing with scientific arguments can be one of two things. They can be well written, easy to read stories with anecdotes and jokes that lead the layman through a complicated argument in a easy to handle way, or they are academic works packed with hard data presented in an objective manner. A rare book is able to combine the two and leave you with a book that is easy to read with an astounding amount of information. This is the first book I've read which achieves neither.
The book is not easy to read and frequently dull. Just when it looks like it is getting interesting it says "but more on this in chapter XX". When you do finally get to that chapter the "more" is entirely unsatisfying. The author frequently offers his own opinions based on what seems no more than a whim, but criticizes other scientists and health workers for their lack of objectivity. He dispatches the question of dreams in a single paragraph suggesting that they are both impossible to study and not worth the effort.
I cannot say that I took nothing away from this book. The author effectively details why much sleep research provides tainted results, and the difficulty of effectively evaluating its affect on cognition. There are also some things which are casually mentioned that I will probably follow up on elsewhere. However, the sum of what is interesting in this book could be packed into 20 pages and the book meanders through almost 200 tedious pages.
I feel bad giving such a negative review, so I will point out that there is a chapter on falling asleep at the wheel which may serve to help save some lives, but I myself traded in my car for a bicycle 7 years ago so it meant very little to me personally.