Tell me what you know about dreaming, dreaming
You don't really know about nothing, nothing

from Kid Cudi – Pursuit of Happiness (Nightmare) Lyrics on Rap Genius

This is a reference to Cudi’s dreaming disorder which causes him to have night terrors on a regular basis. Cudi is trying to get across the point that people don’t understand where he’s coming from, and he has trouble describing his night terrors

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