The other night at about 4:00 am I had to go to the bathroom, which is pretty normal.  I turned on the light and stepped on something and almost screamed until looked down and saw that my 3 yr old had went to the bathroom himself and I guess was so tired that he didn't put his pants back on and laid on the bathroom rug completely zonked out.   I helped him get his stuff back on even washed his hands and sent him back to bed.  He is such a heavy sleeper I am surprised that he got up to go potty.