yeah turkey containts tryptophan but actually a lot of foods do..seafood, chicken, beef, diary. people aren't really affected by the amt. of tryp. If someone is eating on an empty stomach and has a lot of it at once then yes it may, but the feeling most people get at say Thanksgiving is probably more from eating a lot and eating a lot of carbs. when you eat a big meal it causes the body to release more tryp. along w/ melatonin, which both make you tired.