I recently (not on HAL) had a cabin with TWO connecting doors, for cabins on either side of me. One kept trying to open the door at all hours. It happened so often (without success, of course) that I figured the occupants were confusing the connecting door for the door to their bathroom. Other than that, no noise. Ah, but the other cabin...constant shouting, laughter, and general mayhem. No noise from either below or above.