I can understand your being hurt, a man has a lot more strength than a woman—usually.
Maybe if you accompanied your partner to his Doctor appointment they could explain why these actions happen.
I fell out of bed and hurt myself, I certainly wouldn’t do that while awake. It’s not due to repressed aggression toward anyone. When it happens with me it’s because in my dream, I am being attacked by someone and i am responding to that.
You can also do research online, there’s quite a bit of info about REM Behavior Disorder,
I hope things will be better for you, thank you for your well wishes.