Rest. The strain of growing is heavy at all ages upon children, and rest is one of natures means of recuperation. Rest lying down is natural to all animals, particularly to those which lead an active physical life, such as dogs. In many infant schools a daily rest on a stretcher or simple bed is the rule, and it would be a good thing for children if this practice were universal.
Most children are on their feet too much; standing up is a difficult position to maintain, and involves more strain on a child than an adult, while sitting in a chair too long cramps the limbs and tires the back. When lying at full length, the child relaxes all muscles, there is less strain upon the head, the blood circulation and the nerves.