Why are my upstairs neighbors making so much noise?

So i live on the eighth floor of north quad and I've noticed even when I jump as high as I can there's like little to no impact on the floor. meaning its like hard to make my downstairs neighbor be able to hear me or anyone stomping on the ground. Which makes me wonder, how do(es) my upstairs neighbor(s) do it? I don't wanna ask but does anyone have a theory. Its literally so difficult to be able to make that much noise but they always manage to do it and always specifically after 12 in the morning. Why 12 in the morning? It's like they take pride in acting like an upstairs neighbor.