Please guys what do you know about sleep disorders?.

Just entered a new room, and I found out that my roommate talks in her sleep, scratches her body, behaves as if she eats while sleeping while gnashing her teeth.

She also sleeps violently. I can't sleep with her on the same bed, she go use Jackie-Chan style finish me or throw me off the bed. Usually only someone bigger than her can sleep with her : someone like me would be thrown out. She scratches her body as if something itches her while she sleeps.
I v talked to her about it but she said it is a sleep disorder and her younger brother has it too.
I browsed on it and found out she might have Psoriasis.
It is usually worse at night if she is stressed out that day.
Please guys, do you know anyone with this kind of sleep disorder?
And how can it be treated?.

Please no insults
Advice sincerely needed.