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But here's where the reasoning falls apart: although turkey contains tryptophan, so do many meats, chicken, tofu, nuts and dairy foods. If tryptophan made us drowsy, so would these other protein sources.
A more likely culprit is eating a bigger-than-usual meal full of carbohydrate-rich foods such as potatoes, rolls and pumpkin pie because carbs increase brain serotonin levels. Other factors are imbibing in a glass or two of wine or other alcoholic drinks and-if you're the cook-getting up earlier than usual to get the turkey in the oven!