Little ones can explore the importance of sleep in a friendly and inviting way in this nonfiction board book from the bestselling series Hello, World!

Told in easy-to-understand terms ("Astronauts in space snooze in a sleeping bag that’s stuck down so they don’t float away."), this sturdy board book is full of bright illustrations of kids brushing their teeth, reading a bedtime story, turning out the light, and waking up rested. Kids will also learn why our bodies need to rejuvenate, what dreams and nightmares are, and how pets and wild animals sleep.

It's a perfect way to share the science and wonders of sleep with babies, toddlers, and preschoolers.

Look for all the books in the Hello, World! series: Solar System • Weather • Backyard Bugs • Birds • Dinosaurs • My Body • How Do Apples Grow? • Ocean Life • Moon Landing • Pets • Arctic Animals • Construction Site • Rainforest Animals • Planet Earth • Reptiles • Cars and Trucks • Music • Baby Animals • On the Farm • Garden Time • Planes and Other Flying Machines • Rocks and Minerals • Snow • Let's Go Camping • School Day • Bedtime • From Seed to Pumpkin • Rockets and Other Space Machines • Baking • Soccer • USA