James O'Leary, The Most Ancient Lives of Saint Patrick… (1874)
“ Then the saint departed, and the wretched man sank into the sleep of death. Thus when the sleeper, covered with the darkness of unbelief, refused to awake at the heavenly voice which called him from the dead, that he might be illuminated of Christ, he descended into the dark grave, there to remain for ever covered with the darkness of death. Therefore, even to this day, it is among the Irish a frequent imprecation on a feigned sleeper, Mayest thou sleep, as at the word of Saint Patrick Murinus slept! ”
