This article aims to explore the meaning of the notion of the “uncanny” in Nietzsche’s Birth of tragedy. To read today this work is to encounter a text that has preserved intact the force of its philosophical message: man is such only in the alternance and coexistence of health and illness, Apollonian and Dionysian, art and life. The role of Socrates’ philosophy in Nietzsche’s The birth of tragedy, however, needs to be reconsidered. Socrates is also, according to this reading, an “uncanny” figure. This article is dedicated to an analysis of the aesthetical leitmotif of Nietzsche’s philosophy and a comparison between The birth of tragedy and Hoffmann’s Der Sandmann. Topics are the complex relationship between health and illness and the difference between humankind and mechanical robots or automata.