I sleep in a coffin
Dead tired, exhausted from how often I be touring

from Mac Miller (Ft. Talib Kweli) – Family First Lyrics on Rap Genius

Meaning

Dead bodies are buried in coffins; Talib metaphorically sleeps in one because he is dead tired. He literally sleeps in one, though, because the tiny and cramped beds on tour buses are called coffin bunks.

Talib is on the road so much that he’s both dead tired and always sleeping in his coffin bunk.

this luxurious coffin might actually be more comfortable than the coffin bunk bed

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