I work nights and its so quiet with no one around in a darker room. I wish at least one other person was here.
I used to have the same problem, I'd always hear a bunch of spooky noises after everyone left.
Yes. Some nights I get a bit too paranoid.  Especially near the machines I run.  Creepy. 
I worked night shift alone in an office and I'd always hear foot steps in the hallway 