How come it won't stop?!

It;s very annoying! I don't know where the annoying buzzing sounds come from, sound like a construction site! It's been like that for the past week, and I can't really concentrate! Even i switched my radio to the loudest the sounds are still there. I can't stand it any more. The sounds are still on even in midnight! It jst makes me crazy. I really have to go buy ear plugs. At least I can get some sleep.