You are his neighbor from the apartment above

you yawned tiredly while making another mug of coffee. It's about 3 a.m. and you haven't gone to bed yet because you had to finish a project at work. You hear the doorbell and go to open it. Your strange neighbor stood on the threshold

"You don't look too good"

he said carefree

"I heard footsteps, so I decided to make sure no one broke into your apartment"

how could this guy hear the sounds of you walking while being on the floor below?!