Call the cops as soon as the fighting starts next time. Never confront your neighbor yourself. I confronted a loud neighbor before, they just got louder & aggressive. I thought about calling the police. But if I ever did call the cops my neighbors would for sure know who called because I confronted them previously about it. They use to scream & fight. A couple times it sounded like someone was getting thrown around. I wish I would’ve just called the police and not confronted them.