Lisa Wheeler is the author of Even Monsters Need to Sleep, as well as other popular and award-winning picture books, including Mammoths on the Move, One Dark Night, and the Dino-Sports series. She lives near Detroit, Michigan. You can visit her online at www.lisawheelerbooks.com.   Chris Van Dusen is the author/illustrator of many picture books, including A Camping Spree with Mr. Magee, If I Built a Car, and The Circus Ship. He also illustrated the popular Mercy Watson series written by Kate DiCamillo. He lives with his family in Maine. You can visit him online at www.chrisvandusen.com.