II do think that the amount of Tryptophan the average person consumes during thanksgiving dinner is enough to be active. There is 0.24g of tryptophan per 100g of turkey. I usually eat 300g of turkey. This would be 720mg of tryptophan. You can purchase 500mg L-tryptophan gel caps at health food stores that are nicely active @ 1g for me. I take them when I feel restless and need to sleep. I napped out hardcore 20 min or so after eating tonight.. it was so restful and I had kids runnin all around making noise. 30 min felt like 3hrs.