Dreams, allegory, other minds

Dreams in Milton: the way dream figures are always for us and therefore allegorical, and not for themselves. But in Milton this isn't true: the point is to discover the extent to which we're dreams (like Orpheus and Calliope) and the way that beings with the ephemerality and fragility of dreams -- us -- can nevertheless suffer. All by way of reading the Invocation to Book 7.