My neighbor in my duplex is still up at this hour doing some kind of sanding and sawing! I asked him to stop and he won't! 
That is very disrespectful, especially since he is not in a stand-alone home.  Can you tell your landlord about it?
He's my landlord's father-in-law, oddly enough.  I have let him know in the past and will let him know at a good hour.  Next time I'll just call him in the middle of the night and tell him its happening.  Its like he's an insomniac.
That is just crazy!  I hope he stops really soon - or you can figure out how to cut the power off on his side - LOL!