People always dream, the thing is, we can never remember them. That's why I got in a habit of writing down my dreams whenever I wake up. This allowed me to recollect my dreams from my memory a lot clearly, which is why it's easier for me to lucid dream. A disadvantage though, is it got me remembering unwanted dreams, i.e nightmarish/scary ones. Or at least that is what I have noticed. I would assume if I'm forcing myself to remember most, if not all of my dreams, I'll surely come across some unappealing ones. But over time, you get used to these, and sort of ignore it.