A.R.
Have you spoken with your neighbors yet? That really should be the first step. Maybe they don't know they're being so loud or maybe they think that everyone, regardless of age or family size parties til all hours. If they can't be respectful, talk to the landlord next. If the landlord isn't any help, then you may wish to contact the police.
Unfortunately my experience in 'shared living' arrangements (apartments/condos) is that many people don't give a hoot about how their living habits affect others. I wish you the best of luck.