I also think night sights are of limited use. Few reasons:
1) If it's too dark to see regular sights, then it's too dark to be sure of your target. You won't know if you're about to pop that at large serial rapist or if it's just a family member coming home late, getting a drink, etc.
2) Even the brightest sights are still difficult to see. They aren't bright enough to make out well unless you're aiming into darkness, and then are difficult to align since there is no other reference beside 3 floating points. A weapon light, or just holding a flashlight, will be much more effective for aiming, as you have an illuminated background. Also the flashlight lets you ID the target which is quite important as noted above.