Compulsive Furniture-Moving Neighbors Upstairs

I'm convinced that my upstairs neighbors are some sort of compulsive furniture movers. Multiple times a week — and usually late in the evening — I hear loud dragging noises from the apartment above me. This isn't your typical annoying-neighbor squeaky springs problem. This is dragging heavy furniture around the apartment. Why do they do this?? There is never a need to rearrange your living space so frequently.

Update, 12:27 PM: Omg, it's so loud right now it's actually resonating. :(