Elephant & Piggie: I Will Take A Nap! Mo Willems

Gerald is careful. Piggie is not.
Piggie cannot help smiling. Gerald can.
Gerald worries so that Piggie does not have to.

Gerald and Piggie are best friends.

In I Will Take a Nap! Gerald is tired and cranky. Will Piggie be in his dreams? Or will she keep Gerald from dreaming at all?