Published on Friday, November 26, 2010 by Katherine Some say it is the tryptophan in the turkey that makes you sleepy.  But foods like pork, chicken and cheese actually contain more tryptophan than turkey does.  The sleepiness comes from the insulin your body releases after eating the bready stuffing and everything that goes along with the Thanksgiving meal.  Or so they say.  I say different.  I say it is zombie t...