Eli5: Why does it feel like your eyes are sandy, when running on little sleep?
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Part of it is the loss of lubricity others have mentioned, but an other major factor is that during sleep REM helps to exfoliate dead cells on the surface of the eye and eyelids. It can help both problems, if you’re feeling this, to close your eyes and make figure-8’s with your eyeballs for 5-10 minutes.
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