hours,days,nights later. my nightmare is still in my mind

I've had the weirdest dreams & nightmares this week, some of them are driving me crazy to the extent where I actually crack because they feel so real. I've been a ghost, seen my friends die slowly in front of me, transformed into a little bird, escaped (I think!) from a horrible man, & lastly, been cheated on countless occasions by my boyfriend, some with people I know, others... simply just drop dead stunning strangers.

Do you think it's true that what we think about in our conscious mind invades the dreams and/or nightmares? Is it my fault I dream up all these things then? ...because I have put the thoughts in my head! If we could all control our dreams... imagine what the world would be like. Disastrous or Wonderful?

Our minds are so powerful.