I've been working on mine late too. Through to 1am. Mine is in a garage though so I have to ask if you were indoors?
The last couple of nights I've been welding and cutting exhaust. Sawzall and angle grinder. My neighbors on one side are mexican and are very nice and we wave and so forth but we cant communicate.
On the otherside I have neighbors with a dog that barks for hours at a time and everytime I enter my back yard even after I have complained several times so fudge them. I'd listen to the angle grinder on a zuk any day over that freakin dog.