I was in a medically induced coma post car accident. In a medically induced coma, your mind takes information (sounds, smells, etc.) and tries to process it. I would try to explain it, however this YouTube video does a better job.
https://www.youtube.com/watch?v=xrT9XRyDDaE
Well anyway my mind processed the information in ways a horror fan's mind processes information, and my "dreamworld" was like an episode of Kingdom Hospital, poorly written, dark, hard to understand and downright bizarre.
I had chest tubes in, and the machine they attach to sounds like rain or a waterfall. I had a dream I was on a haunted ship. I had a dream that I was drowning. So many things, some that I do not wish to think about.
I had a cool one though, where I was hanging out next to a luxury pool that had double waterfalls with this girl I was sweet on at the time. Apparently she came to see me in the hospital, held my hand, and talked to me for sometime.
I know it wasn't "real" and just a side effect of the coma, but it's a beautiful memory none the less.