When I moved into this building, my neighbor in 3D was at the time a very unpleasant retired librarian. He drove the neighbor above him in 4D crazy with his constant demands that he stop being noisy after midnight. At one point the police showed up around 3:00a.m. to check on the noise. Only . . . my neighbor was sound asleep; there wasn't any noise, although the librarian claimed there was.
Well, last night, around 8:30, noise began above me, as if someone were slamming furniture down, and it continued after I went to bed. The cats heard it and reacted. I woke around 3:45 this morning, and the noise was continuing. I think the ghosts are throwing a party or furiture at each other.