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.