Context:
Macbeth and Lady Macbeth demonstrate the murderer's need for confession to lessen the heavy burden of guilt. Both characters are troubled by a lack of sleep and have a form of nervous breakdown. Macbeth, seeing Banquo's ghost, blurts out his guilt in front of the banquet guests; Lady Macbeth does the same, walking and talking in her sleep in front of the Doctor and Waiting-woman.