why do our eyes feel like they have sand or grit in them when we’re very tired ?
In: 4050
Tears produced by our tear ducts help lubricate and hydrate our eyes. However, the longer we are awake, the tear quality declines. That makes our eyes feel drier and “crunchier” when we blink, similar to if they had grit or sand in them.
Sleeping a full night gives time for the tear ducts to reset to producing high quality tears again.
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