Midnight Vacuuming

I just realized that I am a horrible upstairs neighbor. I am extremely nocturnal and in the middle of the night I get random cleaning urges. SO...Tonight I'm cleaning my room, suddenly I look down at the floor. It needs vacuuming. So I go with it. Mid-vac I hear and feel a tapping coming from the floor. Apparently my downstairs neighbors are quite upset by this. Because I was close to finishing I went ahead and stopped but when I think about it, who are they to dictate when I can vacuum. And just because the corporate world agrees that people should be awake during the day and asleep at night has no bearing on the fact that sometimes at midnight I need to vacuum.