Night goggles... I don't think so. I've seen this discussed in many similar games (especially
Xenonauts) and the result was always the same: breaking the suspension of disbelief and way too much hassle. Let's just assume that soldiers do have some sort of night vision equipment by default, after all they do see in the dark - just not as well as the aliens.
As for the main topic, I do like it. Would love to see more light emitting objects on maps at night, like street lamps in cities. They would be quite helpful... until you blow them up and everything goes dark.
We could also go with bulbs on barns and such, but I think it'd break the immersion a little. Who turned these lights on if there's no civilians on map - that Sectoid medic needed some light to read or what? And where's the switch? Or the generator?