Millions of Americans flocked home this week to pretend they like their families just long enough to get some of Mama’s cookin’ and get in a good nap before sprinting off to engage in the true worldwide holiday of Black Friday. Well it turns out we should throw turkeys another pardon for believing they’re the cause of the excessive sleepiness experienced after the feast. Sure, tryptophan is present in turkey meat, and that does convert into melatonin, but it can’t happen without a little help. The true culprit? All those carbs from the mashed potatoes, cornbread, rolls, and mac & cheese you know you splurged on. These basically put tryptophan in the fast lane for conversion into melatonin. Europeans, sorry if you understood none of the last paragraph.