I’m not sure if you meant “convince” and I don’t know the options giving but you can use words like persuade or prove or etc.
Yes I think he actually sleeps there because throughout the whole poem he talks about how he loves this girl an how beautiful she is. Also by the other Edgar Allen Poe poems and stories I've read by him he seems to talk about death and is very literal about it.
What does this have too do with English. Is it in a book but which one?