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Ok,there is tryptophan in turkey, but there's actually more in chicken and some other foods. It's not the chemical that makes you sleepy after Thanksgiving dinner, it's all the extra energy you use digesting a huge meal.One belief is that heavy consumption of turkey meat (as for example in a Thanksgiving or Christmas feast) results in drowsiness, which has been attributed to high levels of tryptophan contained in turkey.While turkey does contain high levels of tryptophan, the amount is comparable to that contained in most other meats.Furthermore, postprandial Thanksgiving sedation may have more to do with what is consumed along with the turkey, in particular carbohydrates and alcohol, rather than the turkey itself. I hope this helps everyone who is falling asleep on Thanksgiving while watching the parade!!