I have noticed that if I am having some sort of physical pain, it finds its way into my dreams. For example, many years ago, I remember this vivid dream that I was standing in the middle of a dark maroon room. The room had glass walls. All around the outside of this room, there were vampires, standing and staring at me. Telepathically, as they stared at me, they sent sharp, stabbing pains towards my stomach, like being punctured over and over again by invisible swords, and there was nothing I could do but stand there and suffer.
This was a very complex dream, considering all of the ethical and moral dilemnas that were brought up.