Great change occurs in two ways.
In one, the sleeper awakes to an entirely new world whose methods and mores are so different from custom as to engender the sense of being somewhere abroad. The shock between the future and the present stands as a mighty mountain whose ascent requires arduous and steadfast efforts goaded by the nagging stretch that lies ahead. Many of these changes are sudden, many catastrophic. It is a tomorrow that is far different from today. In the other, the sleeper awakes to a world little changed from the one that slipped into the previous night.