One of Christian history's insomniacs, as well as a sufferer of migraine headaches [specifically, scintillating scotoma] was Julian of Norwich, of whom more may be found here. Of greater importance is that she was one of the mystics of the Anglican tradition and her story evocative of that portion of spirituality of which we seem rarely to speak these days.
Given the volume of literature that has been produced about her and her visions, especially since the mid-20th century, it may be safe to say that she is the greatest of Anglican mystics, even if it seems absurd to attempt to measure such a thing.
Lord God, in your compassion you granted to the Lady Julian many revelations of your nurturing and sustaining love: Move our hearts, like hers, to seek you above all things, for in giving us yourself you give us all; through Jesus Christ our Lord, who lives and reigns with you and the Holy Spirit, one God, for ever and ever. Amen.