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!