They make finding the gun easy in the dark .
The first gun I had with night sights was laying on my night stand , about dark thirty I woke from a deep sleep and saw two beeady eyes looking at me . I don't really know why I thought about a snake at the same time but my wife refuses to allow a gun with night sights anywhere near where I sleep since. She got pushed out the bed and can't see the humor in it all.
That's the best "Night Sight" story I've heard!! Shame that your spouse couldn't find any humor in that event.
I can't think of a disadvantage to having night sights, other than in Shootall's case. I've used them for night qualifications along with a handheld or gun mounted light. When the white light is on, it's easy to see even non tritium sights. It's always important to identify your target, so in MOST cases the use of a white light is advisable.
I like night sights on my duty/carry/bedside pistol. My bedside pistol also wears a white light. My wife and I are the only occupants in our house. If I were to awake to the presence of another person in my bedroom, while I'm laying there touching my wife, (we sleep close) I don't need a white light to identify the intruder. The coroner can do that later. I have to assume that anyone in my house uninvited and having passed through a locked gate on my 5' fence, dodged the outside dogs, then entered my locked house, wasn't selling Girl Scout Cookies. Using a white light under those circumstances, means giving up a large advantage. Those night sights would show up great on a dark form.
Savage