For the last couple of years, I have bought almost all the sleep books on the market to help my little kids go to bed smoothly. Our list includes The Going-To-Bed Book, Goodnight Moon, Time for Bed, Max and Millie (Toddler Books), Goodnight, Goodnight Construction Site We love all of them and they all deserve the high reputation. This book is the latest addition to the collection. I bought this particularly for my 18 months old daughter who loves any book with a moon in it. We even have a Uncle Milton Moon In My Room which we keep on until she falls a sleep.While reading the book the first thing that drew my attention was the information provided. I, as a 31 year old person, had never thought that I would learn something from a board book written for toddlers. It tells the sleeping habits of different animals (fish, whales, penguins, birds, elephants, bears, giraffes and horses). Personally, I did not know that some birds sleep with one of their eyes open or that elephants are such noisy sleepers. If I can learn that much I am sure the kids would get a lot from this tiny book.The illustrations are pretty and colors are attractive, moreover the animals can be distinguished easily by kids (I don't like children books with postmodern figures that my kids struggle to identify.)The thing that surprised me most about this book is its ability to put someone in sleep mode. My daughter made me read it over and over for three times in a relatively dark room (we have uncle milton's moon as the only light source) and I don't remember yawning that frequently ( at least 5-6 times in 10 minutes) while reading to her and before I made it to the end of the third round she was already asleep which had never happened before.Therefore among the very good sleep books we have, I can clearly put this one as the top of the list in terms of helping a little one to sleep. It is probably because of it mentions nothing but sleeping animals on every single page and that does affect somewhere deep in the brain. I wish I had bought it long before.