What are the things in your eyes called when you wake up in the morning that look like dried mucous?

you get them usually in the corners of the eye.What are the things in your eyes called when you wake up in the morning that look like dried mucous?
my friends and I called them ';eye boogies'; but I have no clue to the real name.What are the things in your eyes called when you wake up in the morning that look like dried mucous?
My mother always called it sleep. ha! I have no idea if it has a scientific name.

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