Answer:
Here it means that when there is confusion and no hope. When there are purple jar of nights that is coming of night or darkness in your life or complete unsurety and you fall into it unaware of what is going to happen because you have no idea as to what is the solution of the problem.
Explanation:
These lines have been taken from the poem "Patience" by Amy Lowell.
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.
I'm not sure if it would be a protagonist and antagonist?
