Quote from : Dragonfly in Amber Book

During his time with the French army, years before, one of the sergeants had explained to the younger mercenaries the trick of falling asleep the night before a battle. "Make yourself comfortable, examine your conscience, and make a good Act of Contrition. Father Hugo says that in time of war, even if there is no priest to shrive you, your sins can be forgiven this way. Since you cannot commit sins while asleep--not even you, Simenon!--you will awake in a state of grace, ready to fall on the bastards. And with nothing to look forward to but victory or heaven-- how can you be afraid.