This is something we ALL couldn't help but notice, but I am attributing it to Ryan as he was particularly interested in this one. We had heard about "siesta" before, but honestly we had no idea how prevalent it is - at least in the smaller villages. Literally the entire village would shut down from 2pm to 4pm with the exception of one or two bars. At 1:30pm the town square would be bustling with people, kids playing, old folks chatting, etc and at 2pm, the place would be deserted!
This was a particularly challenging one for us as we always found ourselves caught out in no man's land between 2pm and 4pm. Many /most stores are closed on Sunday as well which definitely took some getting used to - we take for granted that pretty much all stores in the US are open 7 days per week - or at least not closed on the same day (Sunday) every week. Spain, or at least Basque Country, definitely has a better work-life balance than most of the US!