L'interpretazione dei sogni, cent'anni dopo ABSTRACT: The psychological understanding of dream and the interpretation of dreams based on it have been strongly influenced by Sigmund Freud's ideas. Both for supporters and competitors of Freud's conceptions, they are still the point of departure for any change or further development in the understanding of dream. Nowadays, anyway, even for the most of Freudians, Freudian dream theory isn't seen as totally convincing any longer. The understanding of dream has changed many times during this century, even within psychoanalysis, and has shown many successive developments in the theory. In this paper, the outcomes offered by cognitive psychology and neurosciences are shown: in these last twenty years, they have produced a huge effort in order to shed a new light on some classical Freudian assumptions.