Our basement family room was infested with drain flies breeding in the crawl space beside it. I’m sure I swallowed a few while watching
television. I was considering using some sort of chemical pesticide; but had no way of knowing exactly where they were breeding. Then I simply hung the Good Night Bug Light in the crawl space, and I haven’t seen a fly since. Also, within a week the number of flies I am catching has gone way down; meaning before long I hope the population will be completely eradicated!