"Irma's injection" is the name given to the dream that Sigmund Freud dreamt on the night of July 23, 1895, and that he subsequently analyzed to arrive at his theory that dreams are wish fulfillments. He described his ideas on dream theory and provided his analysis of the dream, alongside other dreams from case studies, in his book The Interpretation of Dreams.
Sigmund Freud-Stele on Cobenzl in Vienna. Text: „Do you suppose that some day a marble tablet will be placed on the house, inscribed with these words: "In this house on July 24th, 1895, the secret of dreams was revealed to Dr. Sigm. Freud." At this moment I see little prospect on it.“ (Sigmund Freud an Wilhelm Fließ. Belle Vue. 12. Juni 1900). Sigmund Freud-Gesellschaft 6. Mai 1977
Wish fulfillment is the satisfaction of a desire through an involuntary thought process. It can occur in dreams or in daydreams, in the symptoms of neurosis, or in the hallucinations of psychosis. This satisfaction is often indirect and requires interpretation to recognize.
The biblical patriarch Jacob saw the ladder led to heaven, but Freud might have called it a phallic symbol.
Wish fulfillment (Wunscherfüllung) was coined by Sigmund Freud in The Interpretations of Dreams