You've probably heard that a soothing chemical called tryptophan found in turkey meat causes "turkey tiredness." Nutrition experts say, however, that feeling tired after eating a big dinner is more likely a result of all the extra carbohydrates you ate. Starchy and sugary foods such as breads, yams, potatoes, and pumpkin pie are high in carbs. To avoid getting sleepy, use whole-grain bread in the turkey stuffing, opt for more fruit and vegetables instead of potatoes and gravy, and go for a walk outside after you've eaten to help digest your meal.