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For the most part, nowadays studies in the field of « phenomenological psychiatry » draw a sharp distinction between historical, philosophical, and clinical approaches. This paper aims at opening up the field for an epistemological history , which brings out the problems at stake at the origin of the methodological model that Ludwig Binswanger elaborated for psychiatry in the first decades of the 20th century. For this reason we focus on a Binswager’s work of 1928 : The Dream : Changes in its Concept and Interpretation from Greeks to the Present . This work introduces us to the psychiatric and psychological context within which Binswanger dwells upon the problem of methodology in the field of psychopathology. But it also shows us the role that the questioning of dream played for Binswanger’s epistemological reception of philosophical phenomenology.