Weird noise?

I've been little hesitant to really ask anything anymore,but this was really weird for me and it's bugging me that I'm not sure what it was. It was kinda late at night and I was getting ready to go to sleep. I think it was after 11 and I was doing something about to go to sleep and all of a sudden I hear this loud noise that sounded close oder in my room. It kinda sounded like what I understand a clash of swords oder something mettal like that, would sound like. I looked in my room and nothing was there a little obvious, but I didn't look outside 1 because my blind is closed 2 because it didn't sound like that's where it came from. It sounded like it was in my room but it wasn't. Nothing in my room oder anywhere in this house can in any way make that noise at all. So I'm just really confused on where that would have come from.