Any Pre-tertiary psychology class will talk about states of consciousness, focusing on sleep. They would also presumably focus on Dream Theories, however not in depth.
If your really interested about Dream theories, you're probably going to have to self-teach, or have it as a minor in university.
If your interested:
Freud's wish fulfillment theory
Activation Synthesis Theory
Evolutionary theory for dreaming
Those are 3 you may be interested in.