This disease is beyond my practise: yet I have known those which have walked in their sleep who have died holily in their beds.
– William Shakespeare
Macbeth, Act 5, Scene 1. As sleepwalker Lady Macbeth suffers a mental breakdown, the Doctor says that her malady is beyond his expertise. However, he gives her the benefit of the doubt by saying that he has known sleepwalkers who died with a clear conscience and weren’t guilty of anything.