Duncan
In Act II, Duncan is sleeping when he is killed by Macbeth.
Banquo
He is having trouble sleeping, because he is obsessed with thoughts of the 3 witches. (II, i, 8-9) He is very upset when he hears Duncan's death. Banquo was very suspicious of Duncan's murder. It is clear that he intents to investigate further. Perhaps, he suspects Macbeth is not innocent. (II, iii, 127-132)
Macbeth
Macbeth is very nervous about the act. And he wants the evil deed to be done as quickly as possible. He begins to feel guilty right away (II, ii, 59-62) and confesses he could no longer sleep well. (…
