The book follows a very patient Big Monster and a very energetic Little Monster through their night time routine. Little Monster needs to work out their bouncy knees, wiggly bottom, swingy tail, roly-poly back, roaring voice, jumpy feet, jet-plane arms, and finally, their blinky eyes that are NOT tired. Definitely not tired at all. All through the book you can see a tired Big Monster encouraging Little Monster to get all the wiggles out while coaching them upstairs, to bath, pajamas, and bed.
Yokki and his Romani Traveller family live in tents, and move around a lot. They sell their crafts, wisdom, and services as well as perform odd jobs to take them through the slow seasons. Yokki is a gifted storyteller in a community that values oral tradition, and he weaves his tales while the family sits around a fire every night.