new neighbours (neighbors for the yanks)

I have worked full-time for the past 2 weeks, and have a 4-day week ahead of me, before I get a bit of a respite, and I am feeling the stress, paranoia, urge to wash my hands, etc. And to top it off, my new next-door neighbour, a young woman (and perhaps her boyfriend) seems to be a bit of a doorslammer. I asked her politely a few days ago to try to close the door quietly, and she seemed nice enough about it, apologized also. But last night I was home watching movies, and heard the door sort-of-slam a few times around 3 am. I opened my door, and saw a couple of people heading down the hall with their bikes. I heard voices in the hall as well. Then I could hear very faint voices through my wall (which is pretty soundproof), but when I again poked my head into the hallway, I could hear a male and female voice speaking quite loudly from within the apartment, laughing, chatting in a somewhat drunken manner. It was a Thursday night, and to be fair, she (or they) have only been there about a week or 10 days, so it may be a bit premature for me to freak out, but alas, that is my tendency. I'm just hoping it's not a sign of things to come. I wish they had rented the place to a female nerd with no friends.