yogibooboo-
It’s a shame you and your neighbor are having these issues.
Here are a few quick thoughts:
1) Is it possible for you to meet with your neighbor’s rov together and work things out?
2) 11:00PM is awfully late for treadmill noise. 9:00 or 10:00 is more reasonable, earlier if you have young kids. Can they move their treadmill to a room that isn’t over your bedroom(s)?
3) 8:15AM isn’t an unreasonably early time to make noise. As a chessed they may hold off, but it’s really not early.
Hatzlocha raba.