This little poetry collection has a bit of everything: whimsical illustrations, gently rhyming verse, and informative text about the different types of sleep in the animal kingdom. It's just right for bedtime reading with preschoolers through 3rd graders, and would make a good addition to a library's juvenile poetry collection. My only quibble is that the poems tend to restate facts from the prose paragraph fairly straightforwardly, where I was expecting more descriptive, figurative language. Standouts among the poems include the one about the sperm whales and the songbird poem which gives the book its (lovely) title.