I know that when I was pregnant I needed an afternoon nap. Since this is #4 is this sleepiness unusual for you?
Are you inside most of the time. There has been some information about getting some sunlight in the morning that will help with afternoon sleepiness.
http://www.mercola.com/2006/sep/12/t..._confirmed.htm
Of course, if you ask anyone here, no one will recommend gluten for anyone. Too many of us "don't have CD" but we feel better off gluten.
Anne