Bloating from Irritable Bowel when lying down that prevents sleep

I have had IBS-D for 30 years. For the last 10 years I frequently have bloating at night that prevents sleeping when I lie down. I have to (try to) sleep sitting up most of the night until my digestive system finally relaxes and releases the gas. Sometimes I attribute the gas to food, other times to stress, but the resulting bloating is the same. Advil is the only thing I've taken that helps on a reliable basis. Am already using Fodzyme and probiotics that relieve other IBS-D symptoms, but they have no effect on the nighttime bloating and sleeplessness.