Throughout the play, symbols, or objects or ideas stand for something other than that themselves, are used to represent major ideas and themes. What is symbolized by the repeated incidences of images of sleep
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Sleep is the nature's rest and reprieve given to the wary brain. Shakespeare alludes that this is a gift being given buy God. Macbeth has violated both God and nature by killing the king. Lack of sleep represents Macbeth's tormented soul and punishment for his sin.