Sleeping on me, take a nap
But know them dreams about me bad
Knowing I'm awake getting money that you never had

from Asher Roth (Ft. Blu, Exile, Rockie Fresh & ZZ Ward) – Insurance Lyrics on Rap Genius

Meaning

The term being “slept on” would indicate that he feels he is being overlooked and ignored, so he tells those who those who are ignoring him to continue to do so because he is awake and earning money anyways

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