"My heart always sinks within me when I hear the good housewife, of every class, say, 'I assure you the bed has been well slept in, ' and I can only hope it is not true. What? Is the bed already saturated with somebody else's damp before my patient comes to exhale in it his own damp? Has it not had a single chance to be aired? No, not one. It has been slept in every night."
From the best known work of Florence Nightingale (1820-1910), the originator...