Ideas about sound coming from floor
I would start with a good quality area rug placed over the worst offending area.  Next get the feet of you bed up off the floor set on anti-vibration pads.  If this in not enough, consider a full layer of interlocking exercise mats across the entire floor.  Set all of the legs of the furniture in the room on furniture coasters/sliders. If all this fails consider a Christmas gift to the neighbors of a new, quality ceiling paddle fan. Good Luck.