And never fall asleep

from Lupe Fiasco – The Emperor's Soundtrack Lyrics on Rap Genius

Meaning

Five years after Lupe Fiasco’s Food & Liquor was released, a song titled Go to Sleep, hinted to be part of Food & Liquor II: The Great American Rap Album was released

Perhaps all the real rappers should wake up, and all the weak, phony-ass rappers should catch some Zs

If you connect it with the last couple lines it means you can´t fall a sleep because they might make a move on you. This line is quite similiar to perhaps the most famous line in hip-hop:

I never sleep, cause sleep is the cousin of death

Don´t get caught slippin is a common expression in the ghetto and rap music, especially in blood and crips circle. Slippin: Being off guard and careless on the streets; puttin yourself in a position where you’re vulnerable.

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