So it isn’t the turkey that will make you sleepy!
“You just can’t use the excuse anymore that the serotonin-inducing amino acid tryptophan is the reason you conk out after dinner. Foods like soy, eggs, lobster, even spinach have higher tryptophan amounts than turkey. In actuality, it’s high caloric intake plus increased social interaction that makes you sleepy. But you should probably lay off the Tofurkey, just to be safe.”
from “11 turkey facts to pass around the table this Thanksgiving”, factually