I believe Macbeth was insane because he always talk to his self when nobody is in the room. Then he start dreaming weird things about killing Duncan that he really his killing him,but when he wakes up its not real. He was warning Duncan not to wake up or hear the bell because he would either go to hell or heaven. His wife Lady Macbeth put crazy things in his mind that makes him go insane. When that happens he will killed Duncan but does not want to do that. That is why he is crazy and such a wuss.
I agree that he is insane because he talks to him self and he's crazy for listening to he's pyscho wife
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