Bizarre Nightmare

The other night I had a really strange nightmare.  I was in a carriage stop talking to this old guy about a 19th century lithograph.  He kept on talking to me and was saying how wonderful he thought the work was and that it meant a lot to him.  It was 1889 (don't ask me how I know what year it was...) and this guy was really freaking me out.  I recognized him from somewhere, but I couldn't place where.  I woke up, shook it off and went back to sleep about 20 minutes later.  The dream started right back up where it left off.  I was lucid in the dream.  I knew I was me and I knew that it was the wrong time period.  I knew this old man shouldn't be there.  Anywhere.  I was getting progressively more scared because I couldn't wake up.  I felt trapped in my dream.  I woke up again and stayed awake until it was time to drag my exhausted butt to work.  I remembered the dream, which is really uncommon for me and it stuck with me all day, distracting me and nagging at my mind.  I realized the following day why the dream and the old man bothered me so much:  The old man was the soldier I witnessed killed in the friendly-fire incident.  My mind had imagined him as an old man.  This was the first time that he had visited me in this way - normally I would relive the trauma.  This really set me off kilter.  Anyone else experience something like this?