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It has been said of dreams that they are a 'controlled psychosis,' or, put another way, a psychosis is a dream breaking through during waking hours.

Philip K. Dick (2011). “Valis”, p.124, Houghton Mifflin Harcourt
It has been said of dreams that they are a 'controlled psychosis,' or, put another way, a psychosis is a dream breaking through during waking hours.