Very Unsettling Dream, Black Eyes?

My dream started very weird, I was in a place I was very familiar with, but it didn't seem to be that place. Alot of people were there, friends, people I didn't know. We were all partying and having a good time, I don't remember drinking anything in the dream but I ended up being sort of drunk in it at one point. A friend I had known, this girl, ended up trying to kiss me, However I pulled away. Shortly after my girlfriend of a year showed up after I had texted her and called her with no answer. When she saw me though she tried to run away. As I caught up to her and stopped her, I looked at her, and her eyes were completely black. The black eyes freaked me out, and she had almost this devilish grin on her face. When I asked her what she did, she said a few hits of acid... but in real life my girlfriend does no illegal drugs. She continued to try and get away from me as I was taking care of her. We were in a tall building and everyone was leaving. As i went downstairs she didn't follow, so I waited for her at the bottom of the stairs. She was with a group of 5 to 6 girls I had never seen before that all also had blacked out eyes. Slowly one by one they all came down, expressionless, except for my girlfriend. As I rushed up the stairs to the top, one of her other friends told me no, dont go over there, to try and warn me. And I found my girlfriend in the corner, engaging with another man. When I grabbed the kid off of her, she laughed and snickered, we were smashing! with those same big blacked out eyes. Right after this I woke up in a panic and very fearful. Can anyone help explain the black eyes, I have heard it is demons trying to enter.