I've had the same dream in high school where I'm in a fight or flight type of situation, one that involves me killing or taking down a lot of people who are out to kill me. They're zombies, mercenaries, or even school shooters. One in particular took place in my high school where me and some classmates are all trapped inside with zombies who are slowly turning all of our classmates into their hoard. The dream always ends in either me or someone I love dying, and waking up in a full sweat right when that happens.