"What is it she does now? Look, how she rubs her hands."
"It is an accustomed action with her to seem thus washing her hands."
"When shall we three meet again? In thunder, lightning, or in rain?"
People perform violent acts for their ambition. As ambition starts to consume Macbeth, he fears that Banquo's descendants will become kings as said in the witches prophecy. Because Macbeth has no children to pass the throne to, he decides to secure it by killing Banquo and Fleance. "So he is mine; and in such bloody distance that every minute of his being thrusts against my near'st of life" (Mac.3.1.18-22).
Sleep symbolizes innocence and purity in which Macbeth and Lady Macbeth have both lost to ambition. With Lady Macbeth, she sleepwalks while chattering away the crimes she and her husband have committed. She comments about the blood on her hands and how it can't come of her hands. "Out, damned spot! Out I say!" (Mac.5.1.25).
Shakespeare uses the weather to create an ominous dark mood. The three witches always meet in bad weather which foreshadows that something bad is going to happen. "When shall we three meet again? In thunder, lightning, or in rain" (Mac.1.1.1-2)?