Macbeth: The Dagger Scene

For many years people who have experienced Shakespeare Macbeth in some shape or form have always been bewildered if Macbeth in the dagger scene has gone mad and that is indeed a good question. He behaves as if he has lost his mind in the dagger scene, he hallucinates and starts seeing daggers appearing in front of him which are just tricks played by his own mind. His drive into madness may have been from lady Macbeth encouraging Macbeth to kill the king when he believes he cannot do it which drives him into insanity. The job he has to do also pushes him to madness, he is a loyal follower to Duncan and does not feel he can murder him despite his wife's encouraging tone and despite what the witches say wants to be king sooner than later. The scene where he begins  to go insane is the famous "Dagger Scene" where Macbeth, pondering about the murder begins to imagine daggers floating in front of him" Is this a dagger I see before me, the handle towards my hand"  (2.1 22-24) shows that he may be insane and even he himself ponders that.