Right Eye Hurts Today

For some reason, I woke up at 2am and my right eye hurt like all bloody hell.  I think I was rubbing it in my sleep and scratched it or something.  It was one of those moments where you're not really awake but you know something hurts like fuck.  Took me about 10 minutes to realize something was wrong.  I got up, went to the bathroom, asked God, "Why???", rinsed it out, and eventually decided the pain wasn't going to subside.  Luckily I was able to fall back asleep.  When I woke up at around 6am, it didn't hurt nearly as bad but still stings.  WTF?