What explanation did Banquo give for why he had not slept?

Banquo spoke to his son Fleance of an inability to sleep. He admitted to being troubled by the violence of the weather and the starlessness of the night. He implied being troubled by thoughts of the witches' predictions. In Act 2 Scene 1 of the Shakespearean play, he specified the heavenly refusal to give mortals a moon and star lit night. He also specified the 'cursed thoughts' that kept him awake. Those thoughts well might have been full of musings over the considerable royal power and wealth that had been promised by the three witches to his descendants. He well might have wondered how far he and Macbeth would go to realize their separate predictions in their own lifetimes and to their own benefits.