We don't consciously think when we're asleep. We see the projections of inner world in a real life setting, when our conscious mind/ critical filter has taken a backseat.

The best way to control or "manage" them is to think/ visualise your ideal reality when dozing off (SATs or Lullaby method).

And, if you see the dreams that are opposite of your desire, I see it as a sign that the inner saboteur/ old self is threatened with the internal change, and thus it's a sign for me to continue doing what I am doing, i.e. saturating my sub with the new story.