We live in a mid-terrace house and our immediate neighbours on one side have a glass-roof on their side return extension. DC1's room is also on that side of the house. I have noticed recently that they leave their kitchen lights on almost all night long and due to the glass roof this is really bright. In fact it's so bright I don't need to switch on the landing light when going to feed 6m old DC2 in the night because there's enough light coming in from next door. DC1 has a roller-type blackout blind and at nightime there is loads of light coming in from the sides - not sure if this disturbs DC1 but her sleep has been more broken lately too (although this could be due to the heat or who knows what) AIBU to ask them to switch their lights off at night after they've gone to bed (I'm assuming they are all in bed at 3am bit that is an assumption) or should I just suck it up, buy another gro anywhere blind and enjoy the fact that I can wander round at night without having to switch on my own lights? I just think it's an incredible waste of energy (my own energy that is getting wound up at this)