A few years back I lived in an apartment, with another directly above. Sound seemed to travel doward.

A single girl lived in the apartment, and she worked late at night. She frequently would arrive home from work with her boyfriend, and the loud "bedroom sounds", with yells and moans would always wake me up. Her boyfriend would eventually would leave and I had hopes for a sound sleep. But, often her girlfriend would arrive after he left. I would hear similar moans and yells from above that kept me awake for another half hour. No, I did not complain, as it seemed to personal to mention to her. I just got accustomed to it - but, it did cut into my sleep.