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