It’s dried up eyeball juice that can’t be sucked back into your head (through the nasolacrimal duct) when your eyes are shut. Serves no purpose, it’s a byproduct.
There was a Dr. Who episode that had aliens made the stuff.
It’s a type of Rheum called Mucin. However other names for it include sleep, sleepy-seeds, sleepy buds, sleepy sand, sleepers, eye crust, eye goop, cheese, eye boogers, dream candy, winkies, goggles, sleepy dirt, or sleepy dust.
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