This is just a theory, but I think my salivary gland is overactive. While this wouldn't necessarily be a bad thing, but it does cause me drool. A lot. I drool gallons when I'm sleeping, which is a given (and gross). I also drool when I'm focused, so I did this a lot as a kid.
For some reason, I found this really embarrassing as a kid and never told anyone or tried to hide it. I still find myself over self-conscious, but blogging helps. I think. Eh?