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First Witch: "Sleep shall night nor day / Hang upon his penthouse lid"
This quote explains that after the witches grit Macbeth he will be in such great pain that he could never sleep. So night represents pain.

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Lady Macbeth: " Come, thick night, / And pall thee in the dunnest smoke of hell..."

Night signifies, evil. Lady Macbeth acts af if the night as a spirit and asks it to come cover her so she can kill. In this quote night is used as a shield for evil.

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Lady Macbeth: "It was the owl that shrieked, the fatal bellman / Which gives the stern'st good-night."

Lady Macbeth compared an owl's shriek to a death toll since Duncan will never wake from his sleep. Night is paired with death in this quote.

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Ross: "By th' clock 'tis day, / And yet dark night strangles the traveling lamp. / Is 't night's predominance or the day's shame / That darkness does the face of the earth entomb / When living life should kiss it?"
Ross is contrasting darkness and night and light and day. He feels as if night conveys darkness and evil and day is a hero who save the light.

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Lennox: "The night as been unruly."

This is foreshadowing and it shows that one bad night will lead to a bad time for the kingdom.

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Lennox: "The obscure bird / Clamored the livelong night. Some say the earth / Was feverous and did shake."

Although Lennox isn’t aware ofthe murder, the descriptive words create depressing and gloomy mood.

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Banquo: "Go not my horse the better, / I must become a borrower of the night / For a dark hour or twain."

For Banquo, night represents suspicion and mystery seeing as he was weary of Macbeth.

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Macbeth: "Adieu, / Till you return at night. Goes Fleance with you?"

Once again,night represent the time if death because Macbeth was planning on killing Banquo.

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Macbeth: "Banquo, thy soul's flight, / If it find heaven, must is find it out tonight."

The word might in this quote is referring to the ominous time in which the murder will have to be committed.

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Macbeth: "Ere we will eat our meal in fear, ad sleep / In the affliction of these terrible dreams / That shake us nightly."

In this quote, night represent terrors because nightmares haunted Macbeth in his sleep

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Macbeth: "Come, seeling night, / Scarf up the tender eye of pitiful day / And with thy bloody and invisible hand / Cancel and tear to pieces that great bond / Which keeps me pale."

In this quote night isn’t full of darkness, it is a safety blanket blocking out the bad.

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Macbeth: "Good things of day begin to droop and drowse, / Whiles night's black agents to their preys do / rouse."

The phrase ‘night’s black agents’ is a reference to the evil that emerges during the night.

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Hecate: "This night I'll spend / Unto dismal and a fatal end."

In this quote, night provides an increase to the evil vibe of the meeting.

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Macbeth: "How now, you secret, black, and midnight hags? / What is 't you do?"
The phrase ‘midnight hags’ refers to the evil presence the women bring during the night.

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Macbeth: "The time has been my senses would have cooled / To hear a night-shriek, and my fell of hair / Would at a dismal treatise rouse and stir / As life were in 't.

For Macbeth, night equates to fear and recalls to when he heard screams during the night.