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The objection that self-consciousness disappears in deep sleep and hence is not real and lasting is incorrect, for we know afterwards that it existed and disappeared. When we awake we know it and are conscious that we experienced deep sleep although we do not know it at the time of the sleep. So it is known after sleep that consciousness persisted in it.
-- Notebooks Category 19: The Reign of Relativity > Chapter 3 : The States of Consciousness > # 141