True dreams and dreams coming true..... people will always be divided on that area. And for someone to claim to have absolute knowledge about the how, why and if of dreams? Only Allah knows and he knows best
Many will immediately dub such claims (having predictive dreams) false. Many will say such things do not exist. Many more will say it's the devil playing tricks on your mind. I say, who from us knows? I believe in the seen and unseen. I know my brain will never understand the unseen though.
It can very well be subconscious thought processes at work. While you are sleeping, your mind is still working, still problem solving. Maybe your dreams are reflections of that?