According to the text, being awake disrupts the homeostasis of the body in some way and sleep is required to restore it. this is the definition of the theory of sleep.

This is the definition of the recuperation theory of sleep. The recuperation theory is being defined as a belief of where an individual is likely to disrupt his or her own homeostasis once the person is awake and in order to restore it, the individual should go to sleep.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.