The war of "naps" -- How long is good for your health?

Do you remember the conflicting results from studies about "is coffee good for you or bad for you?" and "A little alcohol is good for you or bad for you"?  Now "the war of studies" is about naps.

http://www.smithsonianmag.com/smart-news/consistently-needing-take-long-mid-day-naps-might-be-indicative-underlying-health-problem-180951071/

The conclusion is A SHORT NAP (a power nap) is good for your health.


Here's a competing article.

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Here's another article from the Sleep Foundation