Dream of person, building

Have dreams of being in a gun fight with snipers on top of a high building. I find myself on the ground with bullets flying though the air. I realize I need a gun and have to fire back to survive. I am beside the building some how and look up to the top of building and see a person shooting, I think to stay quite and he won't notice me, when he looks down and begins to fire, I fire back and run to hide. Find myself hiding under a car trailer thinking I am safe here and know one can see me. But then I am seen and have someone firing on me. I roll out of the way and wake up