"Methought I heard a voice cry 'sleep no more, Macbeth does murder sleep', the innocent sleep [...] Chief nourisher in life's feast"
• Exclamatory sentence "Sleep no more" - indicates a belief that Macbeth is referring killing Duncan, but is later revealed to be a defenseless person person while they were in a "innocent sleep". Also shows rampant guilt and madness that will plague him and Lady Macbeth to their deaths.
• Macbeth solely focuses on the abstract idea of sleep. He imagines it to be a weaver who "knits up" in a coherent and composed "ravell'd sleave of care". "Ravell'd sleave" is a messy and disorganised garment, which juxtaposes the alluded weaver's skill. This could be reflective of Macbeth's mental state.
• Metaphor of "sleep" is presented as a tranquil and organising force that helps make a person have coherence over the chaos life.
• In the following lines, he almost casts sleep as the inverse, saying that sleep is the "death" after each "life", the restful "bath" after one works. Emphasises the depth Macbeth feels he has violated human life - by removing the King of Scotland in a somewhat sacred space of rejuvenation.