Invest in some earplugs, people- I think I'd have failed first year without them, my corridor were bastards for noise (kicking a football against everyone's doors at 3am- nice). Go and confront people when it's really bad, if they don't listen then call the porter, and if they don't get the message after a few nights then go to your college tutor/student support person and get college to sort them out.
You'd have thought people might have learned not to be anti-social ******s by the age of 18, but sometimes they still need it spelled out that loud music in communal living areas is a bad thing...