Why can contact lenses be worn all day without issue, but nap with them in for an hour and they get glued to one’s eyeballs and one’s eyes get gunky.
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Well you actually produce less tears when asleep. When you sleep your eyes are closed meaning that you simply don’t need to replace tears as they are lost through evaporation or being rubbed away. These tears also act as a lubricant for your contacts when your eye moves. During sleep we enter something called rem. Rapid eye movement sleep. As you can imagine a lack of lubrication and all this eye movement doesn’t do good for your eye. This causes irritation and thus the gunk as a defense mechanism against the irritant. In this case your contact lens.
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