I've had similar stuff happen, well not the lights, but seeing/hearing/being in situations in my head before I sleep, when I'm sure that I'm awake. The professionals that I've told about this put it down to anxiety even if I don't think I'm really feeling that anxious. The line between sleep and awake is hard to draw and as you are falling asleep I guess these things can happen. It's scary, and not nice to experience. My only adivce is to try and just go along with whatever is happening/you're feeling and try to not get too anxious over it, otherwise you'll become hypersensitive to it and you'll notice more happening when you go to bed.