Emil Kraepelin's concepts of the phenomenology and physiology of sleep: The first systematic description of chronotypes

Emil Kraepelin is considered one of the most influential psychiatrists ever. His research on sleep, however, has received little attention to date. Therefore, Kraepelin's published work was reviewed, statements on the topic "sleep" identified, historically contextualized and compared with current knowledge. His assumptions on the "physiology of sleep" are rather speculative and not substantiated by own research. The opposite is true for his...