In Macbeth, why aren't Macbeth and Lady Macbeth happy being king and queen?

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teachertaylor eNotes educator| Certified Educator

Macbeth and Lady Macbeth are not happy being king and queen because they do not feel that they are safe in their positions.  Macbeth remains feeling ultimately guilty for killing first Duncan and then Banquo, and his guilt causes him to have fits and hallucinations.  He tells his wife that he has been having nightmares and that he does not have a general sense of peace.  The couple fear that someone will find out what they have done, so they cannot rest easily.  Finally, Macbeth fears that the second half of the witches' prophecy will come true and that Banquo's line will usurp him to take over the throne.  How can the couple be happy when they are in constant fear that their time in power is short-lived?