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A extra reasonable explanation is that after feasting on stuffing, mashed potatoes, cornbread, turkey, and pumpkin pie, it's the overeating that makes us exhausted. Indeed, biologist H. Craig Heller at Stanford University has discovered that stuffing oneself stretches our tiny intestines and drives a disproportionate quantity of blood to our digestive tract. This successfully induces sleepiness. Also, let us not forget that some of us will consume challenging cider, adult eggnog or champagne. There's no doubt that alcohol can lead to drowsiness, too.
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