“The interpretation of dreams is the royal road to knowledge of the unconscious activities of the mind.”1 While Freud was already using hypnosis and free association with his patients, he soon felt the need to include dream interpretation in psychoanalysis as well. Freud decided to develop his “dream theory” to go further in his analysis. According to Freud, dreams allow unconscious desires, fears, or emotions to express themselves in disguised ways. Dreams are an expression of wish fulfillment communicating through symbols. Throughout this essay, we will ask how dreams and their interpretation can be useful to psychoanalysis. Why pay attention to nocturnal unconsciousness to deepen the analysis? How and why do we dream? What relationship is there between sleep, dreams and stimuli? How far can the interpretation of the dream lead? Are there any limits to Freud's dream theory?Freud's dream theory complements the method of psychoanalysis: free association and interpretation when studying the meaning of dreams provides a deeper understanding of the patient. Through the "dreamwork" process of his theory, Freud explores the mechanisms of unconsciousness to analyze the process of realizing imaginary wishes.** *Dreams and their interpretation seem to be a controversial issue that never manages to be resolved. a consensus. Before focusing on developing his theory of dreams, Freud noted that there are three different assessments commonly made of dreams: (1) dreams are the expression of a higher state in which repressed fantasies reappear; (2) medical experts believe that dreams respond to sensory and stomatal stimuli; (3) the public considers dreams to have meaning.2 In these premises, Freud developed and strengthened...... middle of article ......or the understanding of dreams and research into psychoanalysis, it seems to have its limits and its uncertainties. The arbitrariness involved in the interpretation and generalization of Freud's theory of seduction can be easily criticized. (Penguin Books: 1991)FREUD, Sigmund, Beyond the Pleasure Principe, The Standard Edition, (WW Northon and Company: 1989)FREUD, Sigmund, The Interpretation of Dreams, translated by AA Brill in 1911, Plain Label Books, (Chumley P . Grumley: 1913) LACAN, Jacques, The Four Fundamental Concepts of Psychoanalysis, The Seminar of Jacques Lacan, Book XI, (WWNorthon and Company: 1998) LAPLANCHE, PONTALIS, Vocabulary of Psychoanalysis, 4th edition (Quadrige : 2004)