You live in Alaska, where it's dark 18+ hours a day for 1/4 the year and you have no night-sights? Are you hoping the aurora borealis is going to illuminate your target?
Night sights, flashlight, a weapons familiarization class for the gf....
Having the GF learn to recognize the roomie's voice might be a good idea.
Having come right close to putting several loads of shot through my front door when my own drunken brother showed up unannounced at 4 AM and started pounding and kicking said door ..... I was not in any shape or mood for voice recognition.... to go from deep sleep to "Fight or Flight" with no serious "Flight" option in the space of 15-30 seconds..... that's a recipe for unpleasantness.