Conjoined twins in a dream: what does it mean?
A dream of two people who cannot separate is a powerful image and a real condition, and those two things need holding apart carefully.
How do the four traditions 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. The four often disagree, and that is the point: a symbol rarely means one fixed thing, and the distance between Freud, Jung, modern research and myth tells you more than any single verdict could.
Freud
Freud would attend to the inseparability rather than the anatomy, since a dream that binds two figures together has removed the possibility of either acting alone. He would ask who the other one was.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
For Jung the doubled figure that cannot be divided can image two parts of a self neither of which can be given up, and the dream is usually about that impasse rather than about bodies.
Our summary of a Jungian reading, in our own words, not Jung's. See Jung, ed., Man and His Symbols (1964).Modern
Under the continuity view this usually arrives almost entirely through documentary and history rather than through experience. It is worth being direct: conjoined twins are people with lives, careers and opinions about how they are represented, and a dream image is not a comment on them.
Our summary of the continuity hypothesis, named by Calvin Hall and Vernon Nordby, The Individual and His Dreams (1972). Its correct scope is disputed; see Domhoff (2017) and the replies to him.Mythological
Doubled and joined figures appear in traditions worldwide, usually as prodigies or omens, and the history of how real conjoined people were displayed and treated is a genuinely grim one that the folklore should not be read without.
Rosmerta Publishing editorial synthesis (after Frazer; Bulfinch).How can writers use this symbol?
The same symbol, read as craft material rather than as a dream. What it does on the page, how genres use it differently, and what happens when you turn it inside out. Written for novelists, screenwriters and poets who need the symbol to actually work, and it ends with something to try.
In literature
Fiction has used this as spectacle far more often than as a life, and the exceptions are memorable precisely because they treat it as a way of being in the world rather than as a condition to be resolved.
Rosmerta Publishing editorial synthesis. Our own words; no quoted text.What it does in a story
It removes the possibility of a character being alone, which is a profound constraint and a genuinely interesting one: every scene has two viewpoints and no privacy in it.
Genre conventions
Historical fiction uses the exhibition, which is accurate and uncomfortable. Literary fiction uses the negotiation of an ordinary day. Horror uses the body, which is where the writing is usually worst.
How to subvert it
Write two people who share a body and disagree profoundly about something small, and resolve it the way anyone would.
Try this
Write a morning routine for two people in one body. Only the logistics and the negotiation.
Only the first of these names a source. What a symbol does in a story, how genres treat it, how to invert it and what to try are our editorial judgement as writers and editors, not findings from a body of research. They are offered as craft opinion and should be argued with.