I woke up one morning recently with blood in a little puddle on my pillow and black crusties up my nose. I'm not so much concerned about this as the cause--is this dehydration, or something else? I've been drinking more water, and it hasn't happened since, but I do want to be sure.

Oh, and don't tell me to see a doctor because I'm positive I'm fine. I just want preventative measures, mostly.