Okay my four year old is able to pee and poop in the toilet all during the day. But at night, no fail, he always wakes up in the morning with a diarrhea style poop. When he poops during the day it is normal. Someone mentioned Crohn's disease, colitis, or celiac. He has been tested for celiacs and it came back negative. I don't know whether to try to train him to get up during the night, but, I am unsure of when he actually does it, he just wakes up with it. He wears a pull up at night...but that is the only time.