Hi,
  I've done a few tandems over the last several years, but now I'm signed up for an AFF course starting at the end of the week.
  I know this question is stupid, and makes me look like a wuss, but I'm going to ask it anyway:  During the day I'm fine, but at night, in anticipation of the course, I have trouble sleeping, and I get very nervous, thinking "What the hell do I need this for?"  So, I think about cancelling, but I know if I cancel I'll regret it, because ever since my last tandem skydiving is all I can think about.
  Is this normal?  Is this a sign that I shouldn't do the course, or just typical pre-AFF jitters?
  Thanks,
  Josh