Tiredness changes our brains and limits our functionality—that was on full display for me as I was moving this weekend. It makes me wonder how often most of us really are tired.

That might be a hallmark of our species’ progression, that we have created and maintained a world where many are less tired. We use our bodies less because we’ve developed solutions to make our lives easier.

Not to say this is good or bad, but is it true? Fighting through fatigue can be exhausting, and in today’s world, we do it much less often.