http://www.juicing-for-health.com/lettuce-nutrition.html
i'm pleasantly surprised reading this. I have been eating raw lettuce as my salad of choice, not knowing that it has helped me on this, besides preventing constipation. Just coincidentally, i haven't been sleeping very well recently due to an active mind, but last night after eating a bowl of lettuce salad, i slept thru the night! Soo... hmm, maybe it does work? haha, try it out urself!