I wouldn't say it's about Asia so much as Anglophones are notable for not taking siestas. Aside from China, it's pretty common in much of southern Europe, the Mediterranean, and Latin America.
Is it, though? I'm from sourthern Europe, and nobody I know under 70 takes daily naps. Even in Spain, where they take long lunch breaks supposedly for taking siestas, only 16% of the adult population actually does so, according to a large study.
