Ericc,
Think practical changes first. Something else you could try is just rearranging your bed situation. Make it so that it's impossible to actually bump into the wall or the headboard or bedside table. You could be bumping when you roll over and it's waking you out of one of your sleep stages or disturbing the depth of sleep and setting off nightmares. Move further away.

Put pillows up around you or move the bed. See how it goes.

Practice good sleep hygiene as they call it. Get into a good routine. e.g. downtime before bed. improve sleeping environment. follow your sleep rhythm/body clock. etc. Easier said than done I know.

Another idea that Jomar reminded me about when talking about books. I have lucid dreams. Not all of them, but sometimes. I can change the ending of my dreams. It can be learned. There are books and articles about this and it's very interesting.

all the best...