Is the life force energy keeping humans alive and giving rise to human consciousness and nonlocal consciousness, derived from the zero-point field or some other energy source? Does the higher astral plane have a differing repository of energy?

The life force energy that animates human beings is not derived from the zero-point field but does, indeed, have another energy source, and that is located within the higher astral plane that has its own repository of energy. It is a very high vibrational divine energy that is shared by Creator as well as the soul-based beings within the higher astral plane, the so-called "light beings," and this includes human beings in between incarnations who are able to return to the light and not become trapped in the lower astral plane where they can flounder unless rescued.