What animals sleep with open eyes?

Sleep is a special state of the body, and for someone it is simply necessary for life in large quantities, and for someone it is enough to sleep very little time for the normal functioning of the body. Scientists have not yet fully investigated the sleep process, but they still found out that animals such as cows, sheep and horses can sleep with their eyes open, while their brain is not completely turned off during sleep, but only half, that is, one hemisphere works while the other is resting. Also dolphins and whales also sleep in this way and do not close their eyes.



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