My concern is more of the extreme nervousness for the LSAT. The trouble of sleeping for me arises when I have a lot of stuff in my head that I can't get out of, keeping me awake, and the day before the LSAT I think it will be very hard for me to turn all those thoughts off and go to sleep (which is what I try to do when I read before bed - get my mind off the day so I have a clear mind when I go to bed.
Last thing I'll say about this. Again, I don't know why people are so weird about mental health. "Extreme nervousness"=anxiety. "Extreme nervousness" that keeps you up at night=anxiety that is interrupting your normal functions.
Listen, the exact same thing happened to me earlier this summer. I was so stressed about the LSAT, I couldn't sleep. I had a very normal routine, I worked out everyday, and nothing was helping. I took a shit ton of melatonin. Nothing. I was doing everything and nothing was working.
I went to the doctor and told them the truth: I was incredibly anxious about the LSAT, experiencing a level of anxiety that I never had, and felt like I could not keep it under the control. I told the doctor I couldn't sleep. Told her I had a routine, worked out, etc etc etc.
She prescribed me an antidepressant. I took it for awhile, kept up with my schedule, and it worked. I took it for about two months. I don't take it anymore. It's not a crutch. It was a novel solution that arose from special circumstances.