I'm done... with nightmares!

Dealing with an human body as I am forced to, I've been subjected to some nightmares.
I read on some lucid dreaming sites that if you have a nightmare featuring some entity, and you can gain control of the dream, you can ask the entity what it represents and it must tell you. This is true in my experience, which consists of a single time. I haven't bothered since that time, and I think that occasion said something about the state of my mind.
I can't remember much, but at the end there was some crazy lady with knives. I remembered the websites' advice and assumed direct control, grabbing her knives by the blades and tossing them away. She tried to grab me or something so I grabbed her hands, which would normally have been a dream-end condition but I was in control and I had something to say! "What do you represent?" She said "I don't know," apparently frustrated by the fact. I was frustrated too, so I said, "thanks, BRAIN." The part of my mind responsible for setting up the dream was also frustrated, because it had gone to all this trouble and now I'd messed the dream all up and it didn't have anywhere to go. So I woke up. I should try asking again some time, though I rarely have nightmares so it could be a while. And there had better be a meaning.