wow - that surprises me: that sleeping on your stomach would make a difference. i can't fall asleep on my back, anyway (good thing i don't want kids !!!).are you on the pill, or have you considered it? i used to have a very heavy, 7-day flow, and really bad cramps back in the day, and the pill gives me a light (after the first day & 1/2 to 2 days) and shorter flow with cramps that aren't so bad. i really recommend it.