I've pointed out in the past that the Anglosphere drinks coffee and tea, while the rest of the world takes naps and siestas and so on. Protestant work ethic cultural imperialism!
Even if the first part was true (it's not), the second part is unlikely to be the explanation: Protestantism, even the Calvinism most associated with the “Protestant work ethic”, isn't a unique feature of the Anglosphere.
That's because the Anglo-American world mostly has a tradition of a large evening meal (instead of a large midday meal) and is largely not in a warm climate; siesta, by varying names, is most common where warm climate and large midday meals coincide, and even there have often been displaced in the modern workforce though long lunch breaks often remain in an echo of the tradition.