Our apartment neighbor seems to enjoy playing techno music into the wee hours of the morning. Our bedroom shares the wall with her living room, so the bass permeates even through ear plugs. We are rarely in bed before midnight on weekdays & later than that on the weekends, so we don't think it's unreasonable that after that she turns it down.
The first few times it happened, we tried banging on the wall & front door with varying degrees of success. One night was particularly bad, DW left a 3AM message with the office. The next day, all of the doors in the breezeway had a ziplock bag with "I'm sorry" scrawled on it & cheap Christmas cookies inside (this was in March). We thought this was an 18yo kid or something, but she's a 26yo with a professional, 9-5 job (WTH?!)
That weekend, neighbor comes over to let us know she's having people over & they might be a little loud & just to let her know if it's too loud. She also added that if it's ever too loud, just let her know, no need to call the office. I told her it was no problem, we would be watching Netflix pretty late, but if it was too loud when we wanted to go to bed, we'd let them know.
Fast-forward to 3AM & I have to ask them to turn it down. The music can be heard all throughout the breezeway. Neighbor drunkenly says "Uh, is it really that loud?" Neighbor's fella-du-jour quickly pushes her out of the way & says "Hey, really sorry about that, we'll take care of it." I'm a lot more diplomatic than DW when it comes to things like people being inconsiderate, especially where sleep is involved (or deprived). I didn't mention neighbor's snotty response until the morning because DW might've murdered her at that point.
We thought that was the end of it because after that the music usually went off by midnight. Last month we came home very late (4AMish) from an out of town funeral. We were physically & emotionally exhausted. Neighbor's music was pumping, but we figured we were so tired it wouldn't even matter. By 5AM it was apparent that the music wouldn't allow us to sleep. I tried pounding on the wall a few times, to no avail. I finally started pounding on her front door, it took her a couple minutes to stumble to the door & look through the peephole. She didn't offer an apology or even have the courtesy to answer the door. She just slurred a few choice curse words & shut the music off.
DW went down to the office the following morning, stating that from this point forward, the next time neighbor's pumping the jams past midnight, we will be calling the cops directly from now on. Simple as that. There hasn't been any further issues, but I'm sure it's only a matter of time.
Needless to say, we are counting the days until our lease is up.