Personally, I think when you die, that's it. Oblivion. No afterlife.
What do you think of all the paranormal shows on television? Do you think these people are lying our that they fake everything? There are people who have been driven from their homes by spirits and unable to return. Whether these are the spirits of the departed or evil spirits is unknown, but when these paranormal investigators go into asylums and other places, I don't believe they're making it all up.
I had a friend from Atchison, Kansas, who had spirits in his home. He told me about his experiences but said these spirits didn't harm them in any way. The family became accustomed to them and that events were relatively rare. On one occasion, my friend said, his mother was carrying laundry upstairs. She tripped and as she fell back, two hands grabbed her by the shoulders and righted her. Assuming it was her husband, she turned and said, "Thank goodness you...." and no one was there. It initially unnerved her, but she reasoned that if the spirit had meant her any harm, it would have let her fall. But every member of the family had their own stories. And no, I don't believe they were lying, crazy or imagining it.
Why would we assume that when we get as low as we can go on the GCS scale we become fully conscious again?
We don't assume anything. If the spirit departs from the body, it is no longer under the restraints of the flesh.