This brought to mind a passage from a letter of Evelyn Waugh's, written to his wife June 2, 1941, just after the battle of Crete:
In case I don't see [his son] again, tell him when he goes to war that the most important thing an officer can carry with him is a pillow. I stuck to mine to the end after I had jettisoned gas-mask & steel helmet & blanket etc & blessed it every hour.and also the story passed on to Gene Fowler by some Scotch immigrant in Colorado, and recounted in Fowler's Timber Line. According to this, a Scottish clan had gone raiding over the board, and was camped for the night. The patriarch, making a late survey of the camp, found of one of his sons sleeping, wrapped in his plaid, and with his head on a stone. The father kicked the stone out from under his son's head, crying "Never let it be said that any son of mine was raised in the lap of luxury!"