Sleeplessness is due, in the majority of cases, to a faulty habit of mind. The preparation for a sleepless night begins with the waking hours, is continued through the day, and reaches its maximum when we cease from the occupations which have in some degree diverted our attention from harassing thoughts, and retire, to struggle, in darkness and solitude, with the worries, doubts, regrets, and forebodings, which now assume gigantic and fantastic shapes. He who would sleep at night must regulate his day, first, by not undertaking more than he can accomplish without undue stress, and, second, by carrying through what he does undertake, as far as he may, without the running accompaniment of undue solicitude, anxious doubts, and morbid fears discussed in the preceding sections. It is futile to expect that a fretful, impatient, and over-anxious frame of mind, continuing through the day and every day, will be suddenly replaced at night by the placid and comfortable mental state which shall insure a restful sleep. Before proceeding, then, to the immediate measures for inducing sleep, let us consider the suitable preparatory measures. The nervous breakdown which precludes sleep is oftener due to worry than to work. Nor should the sufferer jump too quickly to the conclusion that it is the loss of sleep rather than the worry that makes him wretched. It is astonishing how much sleep can be lost without harm, provided its loss is forgotten, and how much work can be carried on without extreme fatigue, provided it be undertaken with confidence and pursued without impatience. It is, however, essential that the work be varied and, at due intervals, broken. Trainers for athletic contests know that increasing practice without diversion defeats its end, and particularly insist upon cessation of violent effort directly before the final test. Why should we not treat our minds as well as our bodies? The active and over-scrupulous business or professional man who allows no time for rest or recreation, who can confer no responsibility upon his subordinates, who cultivates no fad, and is impatient of every moment spent away from his occupation, is in danger of eventually "going stale," and having to spend a longer and less profitable vacation in a sanitarium than would have sufficed to avert the disaster. Nor will he find it easy to change his sleep-habit with the change of residence. It behooves him to change that habit while still at work, as a step toward averting breakdown.