I have a neighbor of my age on the upper floor. I know him visually. I also have a night lifestyle. If at night he plays loud music or a loud company is gathering, I quietly knock on the battery and vice versa :) We seem to understand each other.
I go out to smoke on the staircase tonight. 3 hours. There is no one. And broke up. Not a minute passed, the same sound upstairs... Not in vain we are his neighbors :))