Kind of orthogonal to this conversation, but... with increasing temperatures, I find myself wondering at what point more parts of the US might switch to a formal siesta or even nighttime hours. Last summer my area had a month+ of 100+ degree days, and this year it looks like we will have at least several weeks of it. People, especially outdoor workers, simply can't be expected to work in that for a full on day - people would die. So it makes me wonder if we will start to see interesting shifts in the work day as happens in other parts of the country.