Lucid dreaming come and go once in a while and sometimes it is something that you are thinking about on that day or something that you are about to do in future. I have experienced it several times and sometimes, i control it especially when I know that I am dreaming in my dream. If it is a horrible dream that is beyond my control, I know that I am dreaming so I will force myself to wake up. And if it is what I can control, I try to control it. When I wake up. I adjust what I was supposed to do, so that my dream doesn't play out in reality.