My experience when Sebastian was dying

Monday, July 8th we took Sebastian to the hospital to run the last MRI he would have. They had told us nothing could be done anymore and that he was going to die any minute. We needed to check the status of his tumor, though, to know if it was still there or if it had disappeared. We were very worried because we did not see any signs that showed he would die. I did notice Sebastian was sleeping a lot and his activity level had diminished, but I don´t know when someone is going to die. How does one know when someone is going to die? It´s impossible. It´s uncertain and no one can tell you either when someone is going to die...what day? What time?