Question of the Day: Got Night Sights?

I can’t understand why any handgun suitable for the everyday carry (EDC) market wouldn’t have night sights. For one thing, criminals are largely nocturnal. Night sights are a ballistic blessing when you’re out and about in low-light or nighttime conditions. For another, many, if not most concealed carriers use their EDC for nightstand duty. While I recommend turning on the lights if something goes bump in the night, night sights afford stealthy self-defense options. So, do you have night sights? If so, which ones, how did you choose them or were they standard equipment? If not, why not?