In Macbeth, what does Macbeth imagine he hears someone say about him after the murder. What does this say about his emotional state?Shakespeare,...

In Shakespeare's Macbeth, Macbeth hears a voice

...cry "Sleep no more!

Macbeth does murder sleep,..."  (Act 2.2.38-39)

And

Still it cried "Sleep no more!" to all the house;

"Glamis hath murdered sleep, and therefore Cawdor

Shall sleep no more!  Macbeth shall sleep no more!"  (Act 2.2.44-45)

Glamis and Cawdor both refer to Macbeth, of course.

Macbeth's hearing voices demonstrates the depth of the guilt he feels for assassinating a just, humble king like Duncan. 

Before Macbeth murders Duncan, his guilt at the thought of doing so is demonstrated by his vision of the bloody dagger.  Here, after the act, his guilt is demonstrated by the voice he hears, as well as, by the way, his inability to choke out an "Amen" when he tries to join in with a prayer he overhears after he stabs Duncan to death.