As someone who lives in Spain, a country that also has a tradition of siestas (that's where that name comes from after all), I have a lot of doubts and I think people romanticize the idea too much. First of all I have no doubts about the health benefit of siestas, but in the current society they have some issues.

When I was younger I hated siestas because I had energy and everything was closed, you couldn't do anything in those hours. It felt like a waste. In fact I think that sports clubs, book clubs and similar things are not as important here as in other countries of Europe (at least from my perspective, no data) because people don't have time. After siesta, stores open and you have to do your chores, giving you no time to have a leisure activity (other than going to the bar and drink, that is).

And if you work keep in mind the shift is 8 hours, so how do you fit siesta in it? A way is to start working early and having lunch very late, working like 7-15. Some government offices and factories work this way. Some people like this schedule but waking up so early, specially during winter I think defeats the point of siesta, as you're probably damaging your body in the morning. Other like me have a split schedule with lunch in the middle, more similar to Europe but the problem is that you leave later. Because at some jobs the mandatory stop is 2 hours.

Now, schools have also different schedules to fit better into their parents schedules and there's been an infinite discussion about which one is better for children. The reality is that is a mess. If we could work less than 8 hours, it would be much better but 8 hours plus siesta is difficult to put up with.