I used to avoid night missions, they were just irritating, now you're playing murder in the dark, except against those with better eyes than you, like ratlings, mercs and reticulans, maybe a few others who I don't know the sight range, everything else I know of has lower sight range than you. As mentioned earlier, ALT is your friend, in or out of the light, it helps you see your gals a little easier and lets you know exactly where your just barely noticed target is, as well as where they are looking.
Most maps have at least a little bit of light, ships tend to have some, the aircar seems to brighten a large chunk of the smaller maps.