Why do we sleep? Do animals sleep the same way? What makes us dream? Find all this out and more in Sleep: A Kid’s Guide to the Science of Slumber. Written by Wendy Bjazevich, author of Exoplanets, and illustrated by Juliana Eigner, Sleep is lavishly illustrated and comes packed with facts, diagrams, and answers to the mysterious state we spend one-third of our lives doing: Sleep!