Dream On

I recently finished reading a biography of the artist Salvador Dali who was far and away the Andy Warhol of his day. Or should we say Andy Warhol took his cue from Salvador Dali since the Spanish surrealist came first?
What I don't understand is, if the surrealists painted what they saw in their dreams how come there are no surrealist paintings of students taking of their coats in front of their school lockers only to realize they'd forgotten to get dressed that morning?

song: Dream On • artist: Aerosmith