Snakes Have No Eyelids and Sleep with Their Eyes Open

Snakes lack movable eyelids. Instead, each eye is covered by a single transparent scale called a spectacle or brille. Because they cannot close their eyes, they sleep with eyes permanently open, making it difficult to tell if a snake is asleep.

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https://en.wikipedia.org/wiki/Snake#Senses

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Published: April 2, 2026
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Snake Animals Biology Weird

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