Eye Gunk/Sleep

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Firstly, what actually is it?
Secondly i always seem to get sleep in my eye a lot more often than my girlfriend, but why? What causes someone to get it more than others?

In: Biology

I’m not a massive expert on this, but as I understand it your eye is lubricated with mucus as well as saline. That eye gunk is from some of that mucus drying up and congealing.