I have dreams of stuff that happens and upsets me, but it doesn't usually happen in real life. However on more than one occasion I've been known to bring it up to the person that pissed me off the following day.
As far as controling my dreams, I don't know if I can really control them, but I often find myself realizing that I am dreaming but I can't do anything about it. The other day I was taking a nap and I knew I wanted to wake up, but I couldn't, no matter how hard I tried. I could hear my roommate typing and so I tried to make noises, but I wasn't sure if any came out. After I finally woke up she informed me that I had indeed made some noises. Kinda odd.
Oh, and my roommate thinks her dreams tell the future, and actually a few of them kind of have over the past week.
freaky