Most people know now that the tryptophan in turkey causing you to nap has been proven untrue. There isn’t enough of the amino acid in a normal serving of turkey to cause any sleepy side effects. For your body to feel the effects of tryptophan, you would have to consume the amino acid directly, and in extremely high dosages. The more likely reason your body needs a nap shortly after the Thanksgiving meal is a reaction to an afternoon of free-flowing intoxicants and an overindulgence of irresistible carbohydrate-packed goodies. Feel free though, to blame the tryptophan.