Night racing

Can someone explain why people scream down the highway late at night racing each other?  They make an unbelievable racket and sometimes wake me out of a lovely temporary sleep at, like, 3 in the morning.  Don't they go deaf being that close to that much noise? 

At least they don't do it when the roads are wet, which is another reason to love thunderstorms and rain.  As if I needed another reason for that.  :)