I hear ya Bowfanatic!!!
I usually think about staying awake and then I think about why I hate squirrels. Then I think about the homework I forgot to do and what I' m gonna say to my parents about that ' D' in calc. Then I look around. After that, I listen to my stomach growl for about 5 minutes while wondering if anything else can hear it. All the while I think about how cold fusion could solve all energy problems....NOT!!!
That last part was a joke. Occasionally I think about some girl I' m interested in and how I' m going to sweep her off her feet. We all know how those turn out.

Other than those things, just the same as everyone else, where the hell are the damn deer?