Maybe it is happening, but at much slower pace than the evolution in insects, which have a new generation every couple weeks.

GP has a good point, insect can evolve very quickly. And it is probably much easier evolutionary to adapt to light pollution (it's a software change, after all) than to insecticide (which affects cell chemistry) or complete change in habitat due to its destruction or climate change.

You didn't give an argument. I'll leave it at that.