I Wonder Why : I Sleep (Hardcover)

Favorite questions such as "Why do I get hiccups?"; "What makes me sneeze?"; "What is sleepwalking?" are answered in this lively look at the human body. 

Colorful, surprising, and full of information, the I Wonder Why books have set thousands of young minds buzzing. I Wonder Why I Sleep is the perfect introduction to the body, featuring brains and nerves, sneezes, new babies, and much more.

What do you want to find out? Clear, lively text answers all those tricky questions about how the world works, while friendly, funny cartoons add interest.