why do we dream dreams or nightmares?

I think it really has a lot to do with what is going on in our mind. In fact, in many ways, it has every thing to do with what is going on in our minds, right in our heads. There are many times where I think that we have some extremely troubled thoughts and that leads us to a lot of nightmares. Perhaps it is the fact that there is a lot of deep rooted insecurities coming right to life and the worst case scenarios playing out in our mind right before our thoughts in the world of dreams. There are many times where we drift off to sleep but it is a very troubled sleep. There are some good thoughts, some bad thoughts, and whatever area of thoughts dominates is what indicates what happens what we are sleep. Sometimes it is just a big void, which is a balanced perspective, but other times, we are rather troubled and have some nightmares. It is very fascinating to think about.