"That this is the sense in which our Poet meant this scene to be accepted, is fully evident from his representing both Richard and Richmond to have been asleep during the apparition, and therefore capable of receiving those notices in the mind's eye only, as Hamlet says; which intirely removes the seeming absurdity of such an exhibition."
— Griffith, Elizabeth (1720-1793)
Text from The Morality of Shakespeare's Drama Illustrated: By Mrs. Griffith. (London: Printed for T. Cadell, 1775). <Link to ECCO-TCP>