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Here are some cartoons that deal with the theme of bad dreams:
* The Nightmare Before Christmas (1993): This Tim Burton film tells the story of Jack Skellington, the Pumpkin King of Halloweentown, who discovers Christmas Town and becomes obsessed with bringing Christmas to his own world.

* Monsters, Inc. (2001): This Pixar film follows two monsters, James P. Sullivan and Mike Wazowski, who work for a company that scares children for a living. However, when a little girl named Boo accidentally wanders into their world, they must help her return home before it's too late.

* Inside Out (2015): This Pixar film takes place inside the mind of a young girl named Riley, where five emotions—Joy, Sadness, Fear, Anger, and Disgust—work together to control her thoughts and feelings. When Riley's family moves to a new city, her emotions become thrown off balance, leading to a series of mishaps and misunderstandings.

* Coco (2017): This Disney film tells the story of Miguel, a young boy who dreams of becoming a musician like his idol, Ernesto de la Cruz. However, when he accidentally breaks into the Land of the Dead, he must find a way to return home before midnight or be lost forever.

* Toy Story 4 (2019): This Pixar film follows Woody and the rest of the Toy Story gang as they embark on a road trip to find their lost friend, Forky. Along the way, they encounter a new toy named Gabby Gabby, who is determined to take Woody's place as Andy's favorite toy.

These are just a few examples of cartoons that deal with the theme of bad dreams. They offer a variety of perspectives on this common childhood experience, from the humorous to the heartwarming.