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	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

I read with interest the provocative article by Bursztyn et al¹; however, I question whether the link is as causal as the authors suggested.

Sleep is an important part of life. One feature of populations with a low incidence of coronary artery disease, as in China, is the afternoon nap. It has been an age-old custom for Chinese of all ages, especially the elderly population, to take an afternoon nap. As a matter of fact, it is almost impossible to reach anyone in the Chinese Embassy in Washington, DC, between noon and 2 PM because everybody is supposed to be napping.

The afternoon nap represents an important stress-coping mechanism that can provide protection against coronary artery disease. The results of a small case-control study in Athens, Greece,² supported later by a much larger population study,³ provided strong support for this hypothesis.

If the Jerusalem study indeed suggested a cause-and-effect . . . [Full Text of this Article]

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