The contributions in this volume are based on the works of psychoanalyst and author Michael Turnheim (1946-2009) and delve into the psychoanalytic "sleep with reason," exploring Hegel, Derrida, Blanchot, as well as the clinic of autism and psychosis. Turnheim posed his questions with a subjective and contingent voice. The "mourning" that resonates in such a voice is also the mourning for the loss of the uniformity of psychoanalytic fundamental concepts, of which "mourning" itself will have been one. Includes two unpublished texts by Michael Turnheim. Contributions from Michel Bousseyroux, Marcus Coelen, Joseph Cohen, Hubert Damisch, Klaus Ebner, Francis Capron, Susanne Gottlob, Stéphane Habib, Franz Kaltenbeck, Olaf Knellessen, Eva Laquièze-Waniek, Claude Léger, René Major, Michael Meyer zum Wischen, and Regula Schindler.