What does it mean to dream about demon?
A demon usually pictures an inner force felt as evil or out of control, whether fear, temptation, or a part of the self that has been cast out.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read the demon as a forbidden wish or aggressive drive experienced as alien and threatening, the conscience and the desire at war.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung would see the shadow in its darkest form, the disowned material that grows monstrous when refused. Facing it is the hard work of integration.
Jungian concept (our summary).Modern
Continuity and nightmare research tie demons to intense fear, stress, and sleep paralysis, the mind staging dread in a familiar shape.
Threat-simulation theory (our summary).Mythological
Demons people every tradition, from the Mesopotamian night-spirits to the tempters of scripture, naming the forces that pull against the good.
Rosmerta Publishing editorial synthesis (after Brewer; Bulfinch).