meaning of those dreams. His wife is intoxicating his chamberlain to have him killed. After he let Banquo be assassinated she must have concluded he was too dangerous to be left alive. Now he was to share Duncan’s fate. Terrified by this thought he startles and sees Fleance approaching him with a Dagger. Macbeth grabs his sword ready to encounter Fleance. After having grabbed hold of his sword he turns again to Fleance, who suddenly has disappeared. Instead, there is Duncan’s ghost standing before him. Macbeth is stunned and Duncan tells Macbeth: “Even if you should finally find some sleep, you won’t revive until justice is done upon you and your craven self has left my throne.” It is now that Macbeth startles, sweating and totally exhausted. He understands everything was a nightmare again and sinks back into the sheets.
(Made it up myself)