This hypothesis was claimed by Dr Sam Parnia, director of critical care and resuscitation research at NYU Langone School of Medicine in New York City, after the larger study on a such subject was carried out. Some of those studied, people who suffered cardiac arrest, technically died, but were later revived, say they had awareness of full conversations and seeing things that were going on around them, even after they were pronounced dead.
Facts were verified by the medical and nursing staff who were present at the time. “You lose all your brain stem reflexes – your gag reflex, your pupil reflex, all that is gone”… but there’s evidence to suggest that there’s a burst of brain energy as someone dies. A “hyper-alerted state” in the brief period after clinical death, proved by electrical signals inside the brain, was previously proved in 2013 by researchers at the University of Michigan in a study on rats with induced heart attack. Scientists say now that consciousness persists long after the body has died. People have reported falling through a tunnel and seeing a light at the end of the tunnel. Others have reported floating out of their bodies and watching medics battling to save their lives.Possibly it takes brain cells several hours to die after brainwaves are undetectable.