Use this 'Book: Clifford's First Sleepover (primary/elem)' printable worksheet in the classroom or at home. Your students will love this 'Book: Clifford's First Sleepover (primary/elem)'. When Emily Elizabeth goes to her grandparents' for a sleepover, she thinks she is leaving her small red puppy behind. There are lots of funny surprises in store when Clifford sneaks into her suitcase! This unit accompanies the book to enhance students' reading comprehension and vocabulary skills.