When I was a kid, my brother and I dreamt about ghosts (our rooms were in the basement). One night my dad's friend spent the night on the couch outside our room. Next morning he told my dad he heard things in the night, chains and stuff. My dad put the house up for sale that day.
I know this has nothing to do with your question. Not saying you have ghosts either. Just think it's weird you sister has nightmares in your room.









