Fun thing to try out. First of all, I have never shot a pistol at night in my life let me state that right of the bat. I was taught as many are, to keep both eyes open when shooting. Generally, I do. I did notice something, if you take a headlamp in your backyard, or cross hand a flashlight, and quickly bring your keltec up to aim, I find that I can locate and sight a whole lot faster with one eye. I don't know why. Try it. ( disclaimer, does not apply to the laser folks )
If the sight radius of a gun is long it helps to only use one eye, or if you are using a scope. The same applies to a target that is farther away. With these small guns and the fast target aquistion at close range it is easier for me to use both eyes. YMMV
