This book has cool artwork, and it looks like it was airbrushed. The story uses rhyming and repetition to tell another bedtime story. It is interesting because it talks about different sea creatures and describes how they sleep. For example, a baby whale rests on the back of its mother and dolphins rest close to the surface of the ocean. This is something I had been interested in as a kid- how fish sleep, or if they do. This could be a cute story to read with kids during a science unit about the ocean.
The only negative thing about this book is that I found the repetition somewhat predictable and annoying. On the other hand, kids might not feel the same. In a classroom setting, when I have heard teachers read repetitive books, the kids have enjoyed that fact that they can expect one part of the story every time and say it along with the teacher. This keeps them in the story. For me, it was just annoying, but I didn't read it aloud with a bunch of overly excited kids in the room, so that may be part of it.