In our last apartment, when we first moved to Charlotte, the people above us ran the vacuum at 2:00 a.m. and practiced martial arts.
I had one of those above me when I was working. Finally, at 0230 one morning, I went upstairs, knocked on her door and asked her to please not vacuum at that time.
She had no idea she had a downstairs neighbor, and was awed when I told her I had lived there 13 months. That was the end of the nocturnal vacuuming. ;o]