There's nothing quite like a good nap and it turns out the optimal nap length is a lot shorter than you might think. From Journal Sleep...
The purpose of this study were to compare the benefits of different length naps relative to no nap and to analyze the electroencephalographic elements that may account for the benefits. A repeated-measures design included 5 experimental conditions: a no-nap control and naps of precisely 5, 10, 20, and 30 minutes of sleep.
Findings suggest that the 10-minute nap was overall the most effective afternoon nap duration of the nap lengths examined in this study.
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