I am 45, female, 5 8 , and 120 lbs., in apparently good health. I eat a mostly raw diet, am gluten and dairy-free, and exercise daily. I would like to know why I sometimes (not all that frequently, but it s gone on all my life, perhaps one-4 times a month) feel so sleepy I can t keep my eyes open, and have to have a nap. When I wake up from one of these spells, I invariably have a bowel movement (usually normal, with no pain, or irregular texture, color, consistency, or volume), following which, all drowsiness fully disappears. Is there anything to be concerned about?