DURING CHILDHOOD.--Up to the third or fourth year the child should be permitted to sleep for an hour or so before its dinner. After this time it may gradually be discontinued; but it must be recollected, that during the whole period of childhood more sleep is required than in adult age. The child, therefore, should be put to rest every evening between seven and eight; and if it be in health it will sleep soundly until the following morning. No definite rule, however, can be laid down in reference to the number of hours of sleep to be allowed; for one will require more or less than another.[FN#16] Regularity as to the time of going to rest is the chief point to attend to; permit nothing to interfere with it, and then only let the child sleep without disturbance, until it awakes of its own accord on the following morning, and it will have had sufficient rest. [FN#16] The amount of sleep necessary to preserve health varies according to the state of the body, and the habits of the individual. As already observed, infants pass much the greater portion of their time in sleep. Children sleep twelve or fourteen hours. The schoolboy generally ten. In youth, a third part of the twenty-four hours is spent in sleep. Whilst, in advanced age, many do not spend more than four, five, or six hours in sleep. It is a cruel thing for a mother to sacrifice her child's health that she may indulge her own vanity, and yet how often is this done in reference to sleep. An evening party is to assemble, and the little child is kept up for hours beyond its stated time for retiring to rest, that it may be exhibited, fondled, and admired. Its usual portion of sleep is thus abridged, and, from the previous excitement, what little he does obtain, is broken and unrefreshing, and he rises on the morrow wearied and exhausted. Once awake, it should not be permitted to lie longer in bed, but should be encouraged to arise immediately. This is the way to bring about the habit of early rising, which prevents many serious evils to which parents are not sufficiently alive, promotes both mental and corporeal health, and of all habits is said to be the most conducive to longevity. A child should never be suddenly aroused from sleep; it excites the brain, quickens the action of the heart, and, if often repeated, serious consequences would result. The change of sleeping to waking should always be gradual.