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No hay nada mejor que una buena siesta!!!

A daytime nap containing solely non-REM sleep enhances declarative but not procedural memory.
Tucker MA, Hirota Y, Wamsley EJ, Lau H, Chaklader A, Fishbein W.

Neurobiol Learn Mem. 2006 Apr 26; [Epub ahead of print]

The restorative effect of naps on perceptual deterioration.
Mednick SC, Nakayama K, Cantero JL, Atienza M, Levin AA, Pathak N, Stickgold R.

Nat Neurosci. 2002 Jul;5(7):677-81.