I think you should probably write your dreams down after you have them. It would be good to then look back at what you wrote after a few weeks and figure out if there are any reasons you can discern from it. It can't hurt, that's for sure!
I've written down a couple of my dreams so far, one was about old friends I had and the other one was about something a little random. I don't have anything extensive yet but I'm certainly going to keep on writing them!
Good thing you’re having pleasant dreams. Mine was vivid and a bit scary. I dreamt I was walking through a dark park when I suddenly felt like someone was following me. As soon as I started running, it chased after me. Luckily, I came across someone passing by who helped me. That’s where my dream ended, haha!