siesta

from WordNet (r) 3.0 (2006)

siesta
    n 1: a nap in the early afternoon (especially in hot countries)

from The Collaborative International Dictionary of English v.0.48

Siesta \Si*es"ta\, n. [Sp., probably fr. L. sessitare to sit
   much or long, v. freq. of sedere, sessum, to sit. See {Sit}.]
   A short sleep taken about the middle of the day, or after
   dinner; a midday nap.
   [1913 Webster]