A decent book about sleep. Even if it isn't that actual, already has 20 years, it was till interesting, had good information , made you thing about how strange our relation with sleep is weird in our modern world and it was easy to read. I'm growing an interest into this subject for over 2 years now so I didn't learn much (but still have), having a good background knowledge, but for the new comers, this is a good introduction. The anecdotes to prove the author points wasn't necessary in my opinion and it cost one star to the book. Not perfect, but better then a lot and a book worth reading!