Unihemispherical sleep – or sleeping with one eye open, helps some animals avoid predators while they get some sleep.

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Unihemispherical sleep - or sleeping with one eye open, helps some animals avoid predators while they get some sleep.

Unihemispherical sleep – or sleeping with one eye open, helps some animals avoid predators while they get some sleep.

Unihemispherical sleep – or sleeping with one eye open, helps some animals avoid predators while they get some sleep.

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