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Sleep can be divided into different stages.
True. Sleep can be divided into many stages including REM (rapid eye movement) and non-REM sleep.
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Dolphins do not sleep.
False. They sleep with half their brain at a time.
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Snoring, although annoying, is mostly harmless.
False.
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It is impossible to sleep with your eyes open.
False. People who sleepwalk and babies often have their eyes open or partially open when asleep.
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Cows sleep standing up.
True.
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Fish close their eyes to sleep.
False. Fish have no eyelids!
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