Health & Wellness: Nap Time? Mysteries of Food Coma

The urge to nap after a heavy meal like the Thanksgiving feast is commonly referred to as food coma. But what happens in the body to cause this post-feast dip -- known as postprandial somnolence in the medical community -- isn't clear, according to nutrition and sleep experts.

One fact that isn't under debate: Unlike popular belief, sleepiness isn't caus…