The people across the road are like this to and I have the same concerns as you - just subscribing to this thread for ideas.

It really doesn't sound like a pleasant situation and I can sympathisize with you entirely. I ran our kids' airconditioners all through winter so that the neighbour's noise wouldn't disrupt their sleep (day or night). I felt like sending them my electricity bill at the end. It was worth it for the sanity though.

Good luck with your neighbours - I hope you can resolve it somehow.