Tyrosine
Sorry, this answer is incorrect, tyrosine is not linked to being sleepy after eating turkey. Tyrosine is an amino acid and the precursor of several neurotransmitters, including L-dopa, dopamine, norepinephrine, and epinephrine. Studies have suggested that tyrosine may help people with depression. Meat, dairy, eggs as well as almonds, avocados and bananas are good sources for tyrosine.