Eye Gunk

Why do we wake up in the morning with crusty eyes? I was curious and in case any of you are too, here you go...your day now can be complete.
Pulled from this website http://yucky.kids.discovery.com/noflash/body/yuckystuff/eyegunk/js.index.html#


What is it and where does it come from?
Well there is no official name for it, so call it what you want. During the day our eyelashes are working like windshield wipers repelling this "gunk" from forming, but when we are sleeping this is a different story. "A goopy mix of tears, sweat, and oils from other glands accumulate near the caruncle, the fleshy bump of the commisure, in the corner of your eye.