Aside from what RealDeal said above, which is the real answer, I have another thought, Ariak13:

You might want to do some more reading about what a lucid dream (LD) is and how it works. I suggest that you look at LaBerge's Exploring the World of Lucid Dreaming, and not at the definitions found online.

Why? Because I think you might have misunderstood what a LD is. If you were truly lucid, if your waking-life self-awareness and memory were truly present with you in your dreams, then these nightmares likely would not happen at all, and if they did you would have no real fear of them because you would know they're not real. Plus, if you were lucid all the time, you would have long since mastered a personal method for dealing with the nightmares even if they were targeted specifically at your lucidity.

I think you might indeed have some level of awareness, or at least your unconscious has no problem with including the knowledge that you are dreaming in the parameters of your non-lucid dreams. But this knowledge is really not comparable to the condition of LD'ing.

So instead of making this knowledge stop -- which you likely wouldn't be able to do without therapy anyway, I think -- I suggest you learn more about LD'ing and try your hand at doing the real thing. With the power of your self-awareness truly present, these nightmares will become an unpleasant memory very quickly.

Good luck!