This paper aims at sketching out a typology of some of the uses of dreams in the 19th century by focusing on the dictionaries offering the interpretation of key dream elements, medical and catholic case-studies, and scholarly compilations, which it goes through as so many “pays de rêve”, to pick up on one of Nodier’s titles, in other words dreamscapes as distinct as they are nonetheless related. The paper relates these dreamscapes to the numerous debates concerning the grounding in nature of all dreams, and questions an ambition of comprehensivity that might have carried opposite meanings despite apparently identical formulations. It identifies the new uses for dreams that appear in the 19th century, the most important of which may have been the ambition to draw up a comprehensive and “realistic” oneirology on the model of the hard sciences. The Freudian project, dealt with in an epilogue, is located at the intersection of several of the various “dreamscapes” evoked.