That may have been the difference. We didn't get out until 9am (12hr shift) and by then the sun is high and bright so by the time you've driven home you've spen

That may have been the difference. We didn't get out until 9am (12hr shift) and by then the sun is high and bright so by the time you've driven home you've spent enough time outside where your body has switched from "I'm tired lets go to bed" to "the day is just getting started".