A 2007 study published in the journal Archives of Internal Medicine, found that a habitual midday nap was associated with a reduction of over 30% in mortality caused by cardiovascular problems.
The reasons are currently unclear - and research is ongoing :
Epidemiological studies on the relations between cardiovascular health and siesta have led to conflicting conclusions, possibly because of poor control of confounding variables, such as physical activity. It is possible that people who take a siesta have different physical activity habits, for example, waking earlier and scheduling more activity during the morning.
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