If your roommate is noisy and keeps you from sleeping, studying, or just generally enjoying life, it's time for action. eHow.com helps you find a solution.
First of all, talk to your roommate. They may not realize how noisy they are being. Don't get angry, but in an even tone tell them you need more quiet. Be sure to site specific examples. That may be enough to get them to change their ways.
Set rules for when noise is acceptable and when it is not so that all of you are agreeable. If they can't play the drums after 11pm, you can't start doing step aerobics in the living room at 5am.
Talk to the neighbors. If your roomie is being so loud it's disturbing the people who live around you, then you have extra evidence when you approach your roommate.
Try a white noise app on your phone, earplugs, or even a white noise machine to drown out your roommate's noise. Also adding rugs and drapes will help muffle sound.
If your roommate still isn't willing to change their ways, consider whether you need to find a new place to live or send them packing.