In Palaeozoic history
As I said before, the conditions in Palaeozoic history, when the Primer Fields for the Sun collapse and the Sun turns off, are rare. They occurred only four times, as we have records of them, with the earliest having occurred roughly 450 million years ago.
There my have been earlier, deeper glaciation periods between 650 and 750 million years ago, in which the entire Earth froze up into a giant snowball and remained frozen for tens of millions years of until the Sun became reactivated again. While the snowball-earth theory is controversial, it is well within the range of normal possibility in the context of the Primer Fields dynamics.
Rare as the great glacial periods may be, our existence is linked to them. The coincidence of the dawn of man with the modern Pleistocene ice epoch is significant, as it indicates that our very existence as a highly developed species may be the direct result of the potentially very high cosmic-ray flux density that occurs in times when the solar heliosphere does not exist.
Since the normal 'rich' conditioning for human development gets interrupted by the interglacial periods, which is all that we have known, we really don't know then what 'normal' living is like, even as we are about to become drawn into it again.