By design, sleepers are passive and won't hear sounds until you enter their sleeper volume, because we don't want large sections of a POI being awake and bashing through stuff before you get there. POI designers can group sleeper volumes to help with what you describe, so a debug screenshot using shift+f11 of where you are at would let us see what POI(s) has the issue. We have a ton of POIs, many made before we could group volumes, so there are probably many places where it could be improved.