Well done, I guess! Props to you for examining it in such a methodical way. The next question is can you manipulate you dream content in other ways? You examined your fears and had a nightmare, so can you mentally examine you favourite food, for example, or a sport during your meditations and see how or if that affects your dreams?
I think I could if I practiced. I've had lucid dreams before, but they were incidental and only happened a couple times in my life. One thing I would try besides mentally focusing would be to set a soft alarm (not continuous like an alarm clock though) to go off at different points to try and disrupt my sleep patterns. The goal wouldn't be to wake me, but to merely disrupt deep sleep with the goal of increasing the odds that my consciousness comes to bear. But honestly I really just like good old fashioned sleep and don't feel like I get enough if it anyway :) Waking up is really my biggest challenge, -always has been. I am definitely a night owl.