Comment by maerF0x0

I will admit I'm mostly ignorant on these subjects, but just using rational/logic

> If any task an organism must perform is better done during the day, then evolution has a very clear gradient towards only doing that thing during the day.

But wouldn't remaining conscious and aware be the optimal state? So you don't get eaten by predators or attacked by other humans etc? It seems to me your sentence points to an ultra low energy but conscious state, not one in which you're very vulnerable...

But maybe the vulnerability is just too little, maybe cooperative tribal/family type arrangements covered this sufficiently to not be selected?