But not too loud cause the baby's sleeping
I wonder if it knows what the world is keeping
Up both sleeves while he lay there dreaming

from Lupe Fiasco (Ft. Jill Scott) – Daydreamin' Lyrics on Rap Genius

Meaning

If you’re going to make your car explode, keep it down! The baby (representing our collective consciousness) can only take so much noise before we wake up and revolt.

What don’t we know? That there are plenty of up-and-coming rappers who are bringing lyrical depth back into the mainstream (Lupe, Wale, B.o.B, J. Cole, etc.)

The “sleeping baby” can also be seen as a metaphor for the public who gets distracted by pop culture. When people care about cars, guns, naked women, and drugs, they are oblivious to what’s really going on in the world. They might as well be unconscious like a sleeping baby.

Additionally, this line could also mean that Lupe doesn’t want to “wake up” the children in the projects and expose them to the difficulties of the neighbourhood because it is a corrupting force — he wants them to retain their innocence and not get corrupted by politics, poverty, and the chase of The Cool.

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