Personally, I'd be scrambling to get behind bullet-proof cover or, at least, concealment. Then I'd like to cover the door and check the windows in my peripheral vision. Getting ear muffs on would help, too -- can still hear through them but won't mess up hearing as badly.
Source of the noise could be a cat that got in through a window, or wind or new neighbor's stereo but unID'd visitors would be kept at gunpoint.
I wouldn't light up through the door but if the visitors are hostile, then ventilating the place through the walls is OK as they can do the same to you. Doesn't work as well if you have kids' bedroom down the hall from you.