greg- your story is not uncommon. You seem to have prepared quite well. In fact, it seems to me that you prepared more than a typical law school applicant. That is great, but I think you are running the risk of freaking yourself out, which could hurt your score come test day. Remember, a lot of people argue that the LSAT does not truly test your ability to practice law. Though I would agree, your situation is an example of one thing that it does test.........How do you handle stress? The practice of law is quite stressful, and by placing soo much emphasis on a few hours of testing, law schools can see how people handle it.
YOU ARE FINE!!! YOU HAVE PUT IN THE WORK...YOU ARE SCORING WELL...DON'T FREAK OUT IF YOU DON'T GET ANY SLEEP THE NIGHT BEFORE THE TEST!!!
If I had a nickel for every person who told me that they couldn't sleep the night before the LSAT, I would not need financial aid for law school! Just think how you will feel before a big case! Anyway, you are going to do fine. Continue to study, take a break a few days before the test, take your mind off of it, and if you still can't sleep before the test...don't worry, you will still do fine! You will rise to the task.
I myself did not sleep a wink the night before the test, and scored higher than I was getting on practice tests.
Jason