As essential to life as is exercise is the need for periods of rest and sleep. It is during periods of relaxation and repose that the body repairs itself and reinvigorates itself and prepares itself for renewed activity.

The practice of substituting stimulation for rest and sleep is a ruinous one. The practice was fostered by the medical profession; and while the profession can hardly be accused today of thinking that stimulation can be substituted for rest, it still defends the stimulating practice.

In our present culture, our evenings bring no pleasure for the reason that, just at the time when our tired body needs darkness and rest, we are placed in the unhealthful glare of artificial lights and subjected to the noise of radio, television, jukebox, phonograph and revelers and made to breathe the fumes of tobacco. Perhaps we drink alcoholic drinks or poisoned soft drinks and eat hot dogs and hamburgers. When morning comes with its dewey freshness, we are fitfully sleeping in a darkened room from which we finally emerge into the full glare of the day--little realizing that all sudden changes from light to darkness or from darkness to light are hurtful. Nature's changes are gradual. To sleep in darkness is good, but to live in darkness produces disease.