Das Bewusstsein schläft nicht

According to Sartre, every individual exists necessarily as consciousness of something. Rather implausibly, this seems to imply that one would not survive a dreamless sleep.
The author motivates the issue by, on the one hand, critically and analytically discussing somatic, psychological, ontological, and phenomenological responses to the persistence question, and on the other hand, explaining Sartre’s anti-substantialist understanding of consciousness. Through a problem-oriented reconstruction of Sartre’s ontology, the author eventually demonstrates that, due to Sartre’s concept of time, there can be no unconscious periods, not even during sleep: Consciousness does not sleep – instead there is consciousness of sleep.