Though his family says it's impossible, Justin knows that elephants visit his room at night. His father buys him a toy rabbit to sleep with, but the elephants return. His mother builds him a new bed with ""no elephants allowed"" on the headboard, but the elephants come back with lions. His sister gives him a night light--""Now you can SEE that there are no elephants or lions here""--but the elephants and lions are still there, with alligators. Finally Justin finds his own solution: tacking up a picture of a mean-looking gorilla to protect him. ""And the elephants, the lions, and the alligators never came back again."" A workable variation on a common theme, picked up by Robison's cheerful pictures in flat, basic colors.