But in no way did civilization change life more than by sharpening the line between work and play, and at last that division came to be more important than the old one between sleeping and waking. Sleep came to be thought a kind of relaxation, and “sleeping on the fob” a heinous sin. The turning out of the light and the ringing of the alarm-clock were not so much the symbols of man’s dual life as were the punching of the time-clock and the blowing of the whistle.
