Vacation Jitters

We leave one week from today for our first family vacation since 2007. Before the twins were born. We are only going four hours away but I have already identified what/who the problem will be. I know the car ride is not going to go over as well as it does in my head, but I am most worried about the sleeping situation. There is one of us who is not a very good sleeper. By this I mean she wakes up and cries nearly every night when she hears any sound in the house. Can you imagine what it will be like in a hotel? They fight all the time so being in a confined space for a long period of time surely equals disaster. Why do we decide to take vacations? I remember all the family vacations as a child, and I cannot remember one that didn't involve screaming, fighting and a miserable existence. At least we have air conditioning in the van! Wish us luck and if anyone has any suggestions on how to make this easier pass them along!!