This is somewhat similar to this question, but not exactly the same, because it's not about noise per se and I'm not the one causing it (yet). The floor of my apartment is very light (probably cheap) fake wood vinyl, and it's above a mostly-empty and not well insulated crawlspace, and is attached to one other apartment. And unfortunately, the way the building is set up places the two apartments' bedrooms right next to one another. So, whenever my neighbors perform some certain...oscillatory activities, I can feel the vibrations very distinctively from my bed.
What should I do to cut down on this? Would lowering my bed to the floor help? It is currently supported by six approximately 6 inch metal legs and on a box spring, on a hardwood floor (which I know is the real problem, but unfortunately I can't change that). Would it help to place the bed legs on a rug or something? What about a heavier bed-frame? It's currently resting on the thin metal rails that came with the mattress.
Also, should I assume that anything I do on my bed would be felt in the same way by the other tenants? If it's my bed that's causing the resonance effect, maybe I wouldn't need to worry about bothering them (unless they have the same kind I suppose). Or would whatever changes you recommend also cut down on this?