You can train yourself to wake up at the slightest non-household sound in a state of heightened awareness with no warm-up period. I did it. Anyone can. Also the slightest sound from the kids wakes me up (I can add this or subtract it at will, depending).
Get a good flashlight. I bought three for the kids to play with. They're forbidden to play with the bedside Polystinger. I also have a Photon Freedom in my back pocket all the time.