Question

a siesta is a nap in the middle of the day observed in the united states

Answer 1

The societal custom of the siesta, whereby even business shuts down for two hours during the day and people return home to their families, is a Latin custom practiced in Latin countries such as those found in South America, Spain and Mexico. http://en.wikipedia.org/wiki/Siesta
The term pretty much applies in countries whose official language is Spanish though Brazil might be an exception.