with those whose energy so far exceeds their physical strength that the mere effort of living exhausts them. This condition may be in part due to overstrain of the powers of youth and middle age, but it also follows the fixed idea that years diminish strength and lessen energy. It is easy to fall into this notion, for it accords so well with the general idea that rest must come only after the period of activity, whether that period be a day or a lifetime.

All of us have had periods when we have needed fewer than our average hours of sleep. People who sleep out of doors or in thoroughly ventilated rooms, under warm but light clothing, find that they need less sleep than when they occupy poorly ventilated rooms and wrap themselves in heavy, unhygienic clothing. Fresh discoveries are being made almost daily by those who give intelligent consideration to these things.

Even babies differ in their need of sleep. I know one healthy, happy, beautiful baby who has never slept the average sixteen hours that babies are supposed to need. This child is now between three and four years of age, and has never gone to sleep before nine or halfpast nine at night. Her parents had the common idea of long hours of sleep for infants, and the child had a hard struggle for a while to convince them that she had no such need: such struggles are often called "naughtiness."

She was regularly put to bed at seven o'clock, and all the usual devices for enticing a baby to sleep were practiced. Sometimes she was left severely alone, sometimes she had gentle lullabies sung to her, but, whether alone or in company, this particular baby played and enjoyed herself until between nine and nine-thirty, when she quietly dropped to sleep. She awoke as early as the average baby wakes, happy and refreshed, and her parents finally learned that there is no sleeping rule that has no exceptions, whether applied to infants or adults.

Drowsiness is a sign that we ought to sleep, just as hunger is a sign that we ought to eat. Natural wakefulness means that we ought not to sleep. The child tries to obey the promptings of nature, but we think these promptings are wrong, if not wicked, and force him into all sorts of bad habits. Says Michelet, "No consecrated absurdity could have stood its ground if the man had not silenced the objections of the child."

We are slowly learning that there is no need or function of the body or of the mind that is exactly the same in all individuals, or that is always the same even in the same individual.

But, in spite of this dawning knowledge, we still view with alarm any disregard of the rule, either in ourselves or another; so true it is, as

Thomas Paine says, that" It is a faculty of the human mind to become what it contemplates." We have looked upon ourselves as having certain, unvarying, imperative needs until we have almost become subject to them.

CHAPTER III

THE TIME OF SLEEP

"Women, like children, require more sleep normally than men, but Macfarlane states that they can better bear the loss of sleep, and most physicians will agree with him.'” H. CAMPBELL.

THE

HE amount of sleep, like the amount of food, required by an individual varies greatly, depending largely upon the conditions at the time. Edison, for instance, can go days without sleep when engrossed in some invention, and he has been quoted as saying that people sleep too much, four hours daily being quite sufficient.

In answer to my inquiry, Mr. Edison's secretary wrote, "Mr. Edison directs me to write you that the statement is correct, that for thirty years he did not get four hours of sleep per day." Evidently, experience taught him that an average of four hours per day, if taken rightly and at the right time, is enough for him. He keeps a couch in his workroom so as to sleep when he is sleepy. He does not need a clock to tell him when to go to bed, any more than you need a thermometer to tell you when to pull up the blankets.

Edison is not alone in his views on sleep. He made extensive experiments with the two hundred workers in his own factory which convinced him and most of them that the majority slept much too long. The hands seem to have entered willingly into the trials: perhaps their personal regard for him influenced their conclusions. Napoleon Bonaparte and Frederick of Prussia were both satisfied with four hours of sleep, while Bishop Taylor was of opinion that three hours was sufficient for any man's needs, and Richard Baxter, who wrote "The Saints' Rest," thought four hours the proper

measure.

*

Paul Leicester Ford, who was never a strong person, once told me that he found four hours' sleep enough for all purposes. He did not wish to be understood as saying that four hours' rest was enough, but four hours' sleep. He was one of the few who understood the difference between sleep and rest. He frequently rested; his favorite practice being to lie back in a big armchair with a book, and forget the surrounding conditions. The book created a different set of sensations, which, combined with the pause in physical activity, brought a sense of rest to the frail body. He frequently got his four hours of sleep curled up in the big chair, and was then able to go on with the work which

* It is said, however, that in later life Napoleon carried this too far, and was sometimes stupid for lack of sleep.