that's a tough one
calling the police is a fair method, but it can depend on the police (some will check back regularly) or other factors, eg. whether your neighbor will know who it was and do something asinine in revenge. some people are just inconsiderate, and retaliation doesn't always engender the most forward moving solution. it would be cool if you could make friends with the guy, and say "hey," and they'd understand, it would be cooler if you didn't have to go to the bother.
i'm an electronic musician and i've read a *lot* of discussions about these issues, you could try running your lawn mower outside their window at 2am but they may be drunk and you'll find a gun in your face.
electronic harassment is another thing altogether - well, sort of. it's like playing your stereo loud solely for the purpose of pissing someone off, except a different class of technology. like those "death ray schematics" you used to find in the back of comic books for $15, except the devices actually work. you could pick up an HSS speaker from lradx.com (military contractor, not crackpot vendor) and set out to learn everything you can about them, what makes them tick, illegally acquire personal information, then follow them around and beam voices into their head noone else can hear. a different strata of "electronic harassment" than what are usually referenced as "noise campaigns".
EH would be.. using sub-or super audio frequencies which the target can't detect to harass them. i had this idea about taking one of those "moo box" toys that makes sound when you flip it upside down, throwing it in a cylinder with a motor and a solar panel on it..
cute, but nonlethal. some of the EH devices floating around (raytheon) are lethal. noise campaigning can be debilitating, eg. prolonged sleep deprivation. banging on someone's window every two hours all night for months on end, causing anxiety and aggravation. firing a pistol outside their window.
there's a whole world of crappy ways to treat people.
i don't have a solution for you, but as a musician i can assure you that loud music (and presumably alcohol and smoke) do have a synergetic, debilitating effect
your friend over there is getting it worse than you are. they're just not of the disposition to be concerned.