What could cause me to lose control of my bowels during sleep? i've done this twice.

Sphincter tone: We have 2 sphincters that prevent stool from coming out. One is internal, the other is external. As long as one is working, stool should not come out. If you have had children, you could have damaged these sphincters. Diabetes, ms, infectious diarrhea can cause incontinence.

Stress: Stress of either mentally or medically is the most likely cause. However, this is rare even amongst children there is a change that it could be caused by a seizure while you sleep. Most causes of loosing control of bowels in your sleep are psychological and you should seek medical as well as psychological treatment. Im assuming you are not a health alcohol drinker as well or do any illicit drugs.