Why was banquo reluctant to go to sleep though he was tired and it was late?

Banquo was reluctant to go to sleep because he was troubled by his thoughts and the prophecies he had received from the witches. He feared that the dark and ominous predictions might lead to dangerous consequences, particularly regarding Macbeth's ambition. Additionally, he was wary of the growing sense of unease and suspicion surrounding Macbeth's actions, which made him hesitant to let his guard down in sleep.