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Dolphins do not sleep.
False. They sleep with half their brain at a time.
Cows sleep standing up.
True.
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.
Fish close their eyes to sleep.
False. Fish have no eyelids!
Sleep can be divided into different stages.
True. Sleep can be divided into many stages including REM (rapid eye movement) and non-REM sleep.
Snoring, although annoying, is mostly harmless.
False.
