How does lady Macbeth cover for Macbeth at the banquet what excuses does she give for this wild talk?

Lady Macbeth covers for Macbeth at the banquet by implying to the guests that he has had similar disturbing episodes since childhood, and that they should simply ignore his behavior. She says that Macbeth's visions are a known ailment and advises the guests to leave him alone in his current state.