The Dreamworld is mainly made of an empty blue void, but it is surrounded by stars. It is inhabited by children, Zodiac constellations and Animal Totems who would enter the dimension and sing magical songs to the children.
Despite the Dreamworld being controlled by the Faced Moon, other residents outside the Classic Pyjamasques Picture Book Universe can also access the dimension as a portal by transferring their conscious to travel between Les Pyjamasques Picture Book Universe and the Classic Pyjamasques Picture Book Universe.
In the Series
In "Les Pyjamasques et Roméo Mécano", the Classic Pyjamasques and Ptigarou had to protect the dimension by securing the Faced Moon that keeps the Dreamworld stable from Classic Roméo Mécano using one of his inventions to cut the Faced Moon to pieces, therefore attempting to make people not dream anymore. However, Classic Yoyo managed to turn Ptigarou back into Grogarou to foil the villain's plans.
In "Les Pyjamasques et la momie d’Apophis, Tome II", while Les Pyjamasques ended up being trapped in a deep sleep by Apophis, they dream that they'll play forever in an infinite night. They've also met their friends in the dimension, the villains from Les Pyjamasques Picture Book Universe and the Classic Pyjamasques Picture Book Universe, as well as the Classic Pyjamasques' friend; Utupë. Until the Animal Totems persuade them to wake up so that they can return to school in time.