The speaker of "The Raven" sounds like he's had a rough life, and most people would probably be a little shaken up to find themselves talking to a bird. Still, we think it's entirely possible that he's insane, or at least pretty far down that road. He talks a lot about wild dreams, imaginary perfume, his burning soul, etc. Of course, the possibility that he's headed around the bend raises some other questions. Is this bird really talking? Is there a bird at all? Is this just a kind of fever-dream? We'll hold off on those questions for now, but keep them in mind.
Although it describes an interaction with a talking raven, this poem is about the descent into insanity. It carefully tracks the steps from a state of nervousness to total psychological breakdown.