Sometimes want of sleep is accounted for by a real want of physical exercise. Town children especially are apt to suffer from their limited opportunities of running freely in the open. It is often considered enough that the child seated in his perambulator should take the air for three or four hours daily, while much of his time indoors as well is devoted to sitting. It is necessary for his proper development that he should have opportunities of daily exercise in the open. If for any reason this is not always practicable, a large room, as free as possible from furniture, should be chosen, with windows thrown wide open, in which the child may romp until he is tired. It is rare for children of two or of three years of age, whose case we are now considering, to be troubled by bad dreams, nightmares, or night-terrors. If these should occur, obstructed breathing due to adenoid vegetations is sometimes at work as a contributory cause. Finally, we should always remember that refusal of sleep is, for the most part, caused and kept up by harmful suggestions derived from mother and nurse, who allow the child to perceive their distress and agitation, who speak before the child of his habitual wakefulness, who unwittingly focus his attention on the difficulty. It is cured in the moment that the suggestion in the child's mind is reversed, in the moment when he comes to regard it as characteristic of himself not to make a fuss about going to bed, but to sleep with extraordinary readiness and soundness. Let every one join together to produce this effect. Let the suggestion act strongly on his mind that all these troubles of sleeplessness are diminishing, that night after night sees an improvement, and soon his reputation as a good sleeper will be established, and, as always with children, it will be rigidly adhered to.