I had esophageal cancer 4 years ago which included a total esophagectomy. I had post surgery complications with leakage that nearly killed me. Somehow got anxiety and could not sleep while in hospital and was prescribed Ambien and Trazadone. shortly after I got out of the hospital I defacated in my sleep and did not know until I woke up and have only defacated a few times after that until the last few nights I have defacted every night for 4 nights in a row, Can someone explain to me why this is happening and I m not aware that i m doing this while I sleep until I wake up ?