Duncan was asleep when he was murdered

" Macbeth does murder sleep, the innocent sleep, sleep that knits up ravell'd sleave of care, The death of each day's life."

-Macbeth stabbed Duncan as he was asleep

-Shakespeare used sleep in this scene to represent how Macbeth was able to go into his room and kill him without Duncan hearing him

Banquo was put to sleep by the Macbeth murderers

"There's but one down; the son is fled."

-Shakespeare presented sleep in this part to show he is dead and how the murdereres killed him

Macduff's son was killed in the castle

"He has kill'd me, mother."

-Shakespeare showed sleep when Macduff's son was laying dead in the castle

-He was killed by the Macbeth Murderers