From The Potent Self

Reversibility is a feature of all correct action, even sleep. Thus, the well-coordinated mature person, such as found among people who have succeeded in making their occupation their pleasure, can go off to sleep when he feels like it and wake up when necessary. Moreover, all healthy animals and humans do not object to being awakened, as they can stop sleeping and resume sleeping without trouble. The ability to stop an action, a process, restart it, reverse it, or drop it all together is one of the finer criteria of proper acture.

—Moshe Feldenkrais

[Emphasis added.]