Probably because you’ve over ate! Festive meals usually include appetizers, alcohol then a large meal and of course some delicious apple or pumpkin pie.

Your body has to send extra energy to process all that food and  you wonder why your tired?

Yes, it is true turkey contains an amino acid called L-tryptophan, which the human body needs to build certain proteins. The body uses L-tryptophan to make serotonin, which has a tranquilizing effect. A 100 gram serving will not make you sleepier than other food sources. Many foods contain the same amino acid  in much greater quantities than turkey. Ever feel sleepy after eating raw soybeans? Maybe you should. They contain more than twice the levels of L-tryptophan than turkey does.