Insomnia

It's maddening.  

Each night, as the seconds tick away, and you're still not sleeping, as the exhaustion creeps in, the frustration builds as you realize what your day is going to be like tomorrow.  You realize how hard it's going to be to get up in two hours in order to make it to your first class.  You realize you probably won't make it to your first class.  You think about how hard it's going to be to pay attention through your second class.  You worry about whether or not your boss will notice your decreased productivity.  You wonder what problems or arguments your increased emotional sensitivity will get you into.  You try to see the bright side -- at least you'll be tired enough the next night, that you'll sleep well.  Won't you?  

No.  The next night, you'll watch as the clock hits 3am . . . 4am . . .

Or maybe that's just my experience.  

Either way, it's maddening.