"Here's the smell of blood still; all the perfumes of Arabia will not sweeten this little hand. O, O, O" (5.1.44-45).
"Still it cried, 'Sleep no more' to all the house; 'Glamis hath murder'd sleep', and therefore Cawdor Shall sleep no more: Macbeth shall sleep no more" (2.2.44-45).
Click to Edit Title
Doctor and the Gentlewoman witness Lady Macbeth's remorse while she sleepwalks with an uneasy mind. Blood imagery is frequent motif that signifies the guilt and remorse felt by the Macbeths. Lady Macbeth acts as if though she still has Duncan's blood on her hands, yet her vision of blood represents how she cannot erase the remorse she feels for past evil events, saying how even perfume could not mask the smell of her guilt.
Macbeth returning with the daggers is the first time we see him post murder of Duncan. His immediate remorse is demonstrated when he supposedly hears voices that say he has ruined sleep and that he won't ever have a peaceful rest again. His wife looks at him like he's crazy. Sleep represents a safe and relaxing time, but it will become a time for Macbeth's wrongful actions to torment his mind from this point on. He's not going to sleep well again because he's destroyed his peace.