Light. In the global south the days are a little longer. Part of the prodistant work ethic, which comes from northern europe, is based on the far shorter workday in the winter. You dont take naps if you only have eight hours of useful daylight. Even in summer the sun is always lower on the horizon. So too the dramatic shift from summer to winter. Even in high summer no time can be wasted in preparing for winter. The drive to make use of limited time is tied to the seasons.