What does it mean to dream about possession?
Dreaming of being possessed often reflects a fear of losing control of yourself, or a feeling that some urge or influence is acting through you against your will.
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 possession as a forbidden wish taking hold, the self overridden by an impulse it refuses to own. Blaming an outside force lets the dreamer disown the urge. Ask what you might be doing that does not feel like you.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung described being seized by a complex or by the shadow, a split-off part that takes over when the ego weakens. The invading figure is usually one's own disowned content. The dream may ask what part of you has been ignored until it took the wheel.
Jungian concept (our summary).Modern
Threat-simulation theory suggests the dreaming brain rehearses a profound loss of control, which possession dramatises vividly. It can follow times you felt overwhelmed or not yourself. Notice whether you fought the influence or surrendered to it.
Threat-simulation theory (our summary).Mythological
Across cultures, possession marks a body entered by spirit, sometimes for harm and sometimes for prophecy. The same image holds both dread and a hint of contact with the unseen. What the dream calls for is worth weighing against which of those it felt like.
Rosmerta Publishing editorial synthesis (after Frazer; Brewer).