Having had a couple of days to think it over, I believe that part of the dream may have been to do with a health problem I had last year. The thing that abhorred me the most was being the "doctor" and the "guard", killing without emotion.

I don't quite reach the stage of lucid dreaming, except when it is the "can't find the toilet" dream. As a child, I learnt that finding the toilet meant wetting the bed, so I always find something wrong with even the cleanest of toilets in my dreams.