Eli5: Why does it feel like your eyes are sandy, when running on little sleep?
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Your tear ducts create a mixture of liquids and oils (tears) to coat, lubricate, and protect your eyes. When you stay awake longer, the quality of these tears worsens so your eyes will be more exposed to the surrounding air, causing dryness and irritation.
Sleep allows your tear ducts to recharge and go back to producing high quality tears.
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