Can't Sleep

This morning I woke up at 6:30. Given my recent lifestyle this is a fairly absurd hour to be awake, so why did I do it?

I'm glad I asked; I woke up in order to go to the gym I just joined NYSC. All went as planned, I woke up went and rode a bike for fifteen minutes or so and then did their XPressline total body workout. It wasn't really a total body workout but it did hit eight major muscle groups and it wasn't terribly taxing. Basically it was a great way for me to get started again. Afterwards I went to work and put in a boring day of researching SharePoint.

So the thing I'm trying to figure out now is, how can my body be so tired and my mind refuse to wind down enough for me to fall asleep? I mean, the circles under my eyes are so dark it looks like I was in a fight but I can't sleep. Bah!