I don't know. I don't know if anyone has ever tried to take control of their dreams. I don't know if anybody understands them well enough to know if they are happening at the same time as we dream them, or if they are only an echo of things that have already happened.
I don't know if it would have been better or worse to know what was coming. Not really sure how you prepare for the kinds of things that happen to us in that world.