One night, just as Jim is dropping off to sleep, the bedsprings creak and a head pokes out from under his bed. It is Mr Underbed, asking to sleep in Jim's bed. His snoring keeps Jim awake and so he goes to fetch his earmuffs from the chest of drawers. But there he finds two more monsters. Soon the whole room is full of monsters as Jim goes around opening all the cupboards and chests. And they all want to sleep in Jim's bed!