"Don't Let the Pigeon Stay Up Late!" is a children's picture book written and illustrated by Mo Willems. The story features a humorous and persistent pigeon who desperately wants to stay awake past bedtime. The pigeon employs various tactics to convince the reader to let him stay up, including pleading, bargaining, and making silly arguments. The book engages young readers by encouraging them to interact with the pigeon, responding to his requests and objections. Its simple text and expressive illustrations make it accessible for early readers, while the relatable theme of bedtime struggles resonates with both children and parents.