This actually happened to me, that one night for some reason I woke up at 3 am or so. And I was listening to music, and all of the sudden I heard a deep voice say "Don't disturb the dreams of others or I will come for you", and I was scared to death, and thinking to myself "I'm not going to say a thing, neither wake up anybody" and other stuff, and I heard that same voice say "YOU DID IT!" and I turned fast to the bedroom door, and there was this girl standing, moving really really slow towards me, and what amazed me was that I couldn't move, or scream, or anything, and like I had my arms cross if that means anything to people who have experienced stuff like this. So after a little bit, she disappeared and appeared, and every time I would stay frozen.
It wasn't a dream, and I know that for sure, because three weeks later, I went to my sister and her husband's apartment, on a friday night to celebrate his birthday (even though it was on that tuesday, they were going to work all week so we decided it to make it 4 days earlier), and for some reason I decided to go to their empty room and fell asleep on the floor listening to music. My parents finally woke me up at 11:30 and we went home.
So that whole week we didn't see my sister and her husband, but the next monday when I got to see them, without me telling them about what happened to me with the girl, they told me that strange things had been happening to them all week long, and it freak the crap out of me when they told me that he had his arm crossed whenever he felt something heavy on top of him that didn't let him scream or ask my sister for help, and even both told about how they each saw a girl, like he did, she did thing. So there, I definitely was sure it hadn't been a dream.
Some days later I traveled 12 hours into my home town El Paso, Tx, where most of my family lives. And my dad wanted to rest at my cousin's house, so I slept in the room with my cousin's, again hearing music. Next morning we went to Mexico, and two days later when we came back, my cousin's told me of some things he started to see including a girl. And I don't know, in my opinion is hard to make inferences off something because there might have been other factors that did this girl to come, but its just a really bad situation to face.