The Archbishop with the dodgy dating was called James. And I can't see him having much to do with making the Sign of the Cross, since he was a Protestant Archbishop of Armagh (died in Surrey, England in 1656).

That's a good blessing anyway Mbo. Here is another:

May thy holy angels, O Christ, son of living God,
Guard our sleep, our rest, our shining bed.

Let them reveal true visions to us in our sleep,
O high-prince of the universe, O great king of the mysteries!

May no demons, no ill, no calamity or terrifying dreams
Disturb our rest, our willing, prompt repose.

May our watch be holy, our work, our task,
Our sleep, our rest without let, without break.