Caillou is a big boy now. When his sister Rosie goes to bed, he can stay up with Mommy and Daddy. However, when the games and stories are over, when his parents leave the room and close the door, Caillou feels very vulnerable by himself in the dark. Sleeping alone is an important step toward growing up and feeling independent. With the help of his teddy, Caillou will prove to his parents that he really is a big boy! Developed with the guidance of a child psychologist, Caillou: Good Night! illustrates how Caillou's ability to overcome his fear of separation helps him gain more independence in small but important ways. CAILLOU'S ESSENTIALS is a collection of books about Caillou growing up. It depicts the developmental milestones, both the small and the significant, of toddlers striving to become self-confident and independent. The stories present a range of childhood experiences, such as potty training, brushing your teeth, trying new foods and learning to share.

Although he feels vulnerable alone in his bedroom, Caillou learns to manage his fear of the dark and fall asleep by himself.