Wake me up before I’m dead
Don’t bury me with monsters in my head

from Crooked I (Ft. Slaughterhouse) – Monsters In My Head Lyrics on Rap Genius

Meaning

A call for help. .

He need assistance to get out of this depression before he kills himself, and “get buried with his demons”. .

Still on religious note, Christians believe that “suicide involves self-murder, then anyone who commits it is sinning and is the same as if the person murdered another human being.”
Therefore, if you commit suicide, you’ll go to hell, where demons (and monsters) are. .

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