How does this happen?

In my 8 years + being a mom, unless my memory fails me, I don't believe I have ever had a child have diarrhea in the middle of the night. Throw up yes, the other end, I really don't think so, that is until last night. A little after 2am I hear Red and I look and see the bathroom light on. I thought I heard him say he peed his bed. I got up ready to deal with a wet bed. As I got into the bathroom he was crying and said he pooped his pants. Sure enough there was diarrhea on the floor. I get him and the bathroom (it was on the toilet, floor, and cabinets...that one I don't understand) all cleaned up and put him in bed. As soon as my head hit the pillow Peanut woke up and wanted to nurse. Up she came. When she was done and asleep she was squirming and I had to take her back to her bed. Then she woke up again when she normally wakes in the morning about 5am and came back to my side of the bed wanting in. I really didn't want to deal with her but I really wanted more sleep. So in the bed she came and stayed there until my alarm went off. I got up and got the two older kids up and ready and sent them to school with J. I was hoping that Red would of stayed sleeping but all the noise woke him up. He really dislikes missing school. This is how our week started hopefully it will end better!