I agree, that's why I think he was not alone. Just can't believe that nobody can hear anything, only rooms have doors, between floors there is an open space. I live in Croatia, EU and it is very normal in our country, and neighbouring ones, that people build houses like separate apartments even though is normally just one house (so one day, if you have kids, they can have separate flats to live in). So for example, my father built his house three floors/three apartments. And just to point out we have brick houses. So sometimes when I stay at his place I normally sleep on the third floor. I have room door, and another one is on the foot of the stairs. then there is a second floor, so again every room has doors and the other one is before second flight of stairs. Then the first floor, again front door... So, here is normal that someone on the first floor wouldn't hear me from the third, but if someone is on the second floor he could. At 3am, 4am without a doubt, because everyone is sleeping and it is quiet. Something happening in the room above mine, you can hear commotion, footsteps...