It might be called a magnificent prison.
"It was a long time before I was able to make out what place I was in, or to take account of the details I describe.

My mind appeared to strive in vain to shake off the heavy darkness of the sleep from which I could not rouse myself.

I had vague perceptions of space traversed, of the rolling of a carriage, of a horrible dream in which my strength had become exhausted; but all this was so dark and so indistinct in my mind that these events seemed to belong to another life than mine, and yet mixed with mine in fantastic duality.
"At times the state into which I had fallen appeared so strange that I believed myself dreaming.

I arose trembling.

My clothes were near me on a chair; I neither remembered having undressed myself nor going to bed.
Then by degrees the reality broke upon me, full of chaste terrors.