a midday or afternoon rest or nap, especially as taken in Spain and Latin America.

1645–55; < Spanish < Latin sexta (hōra) the sixth (hour), midday Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
siesta (sɪˈɛstə)
a rest or nap, usually taken in the early afternoon, as in hot countries
[C17: from Spanish, from Latin sexta hōra the sixth hour, that is, noon]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"mid-day nap," 1655, from Sp. siesta, from L. sexta (hora) "sixth (hour)," the noon of the Roman day (coming six hours after sunrise), from sexta, fem. of sextus "sixth" (see Sextus).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The siesta and mortality in the elderly: effect of rest without sleep and
  daytime sleep duration.
But many people, and experts, praise the benefits of a siesta or a power snooze.
Much of the world, though, prefers to take a siesta.
Bring earplugs for your afternoon siesta and evening sleep.
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