Dream About Friend Killed By Monster

This dream was about

So it was me and my friends and like we were supposed to hide behind something or like you have to hide because each round there was like a monster that will come and scare you and if he scares you he kills you. So I started the first round everything went normal, the second, the fourth, the fifth. Well the fifth was the hard one. I started like I hid behind the couch and my girlfriend was next to me. So then I saw the monster killing people outside the window and which was one of my friends and then he came to my girlfriend, killed her in front of me and then right before he was about to kill me I woke up.