I also, on top of needing the fan to cool me down, quickly learned of its amazing abilities to dampen any loud or obnoxious noise my neighbors were creating so I could get some sleep. And of course now I can't really fall asleep without the fan going.
How do you best get to sleep? Do you like a little white noise or are you a crypt sleeper (black as night and no sound at all)? How do you dampen down the neighbors when they're stamping around like a herd of elephants?