What's the technical term for eye boogers?

Factual Questions
1

You know, that dried snot that comes out of your tear ducts while you are sleeping.

I’ve asked before and the answers I’ve heard are:
Sand
Sleep

but both of these appear to be regional slang rather than a dictionary definition.

2

Rheum.

3

Rock, thanks! :slight_smile:

4

This is an excellent Scrabble word.

5

Or, as Granny might have said: “rheum, it is.”