Please be aware, however, that NDE experiences can only be told by those who have undergone clinical death. Once an individual is biologically dead, there's no coming back.
There is now some pretty strong scientific evidence that suggests endorphins and other chemicals that are released in high amounts during moments of extreme stress, such as when near to death, are most likely responsible for the brain activity and psychoactive effects (hallucinations) that people who've had NDEs report (light and tunnels and so on).
That said, the experiences vary greatly from seeing loved ones, travelling down a tunnel toward a bright light, being stood in the middle of nowhere. An interesting one that I read about was from a man who said he could see noting but perfectly still, glass like shallow water, few inches deep let's say, all around him reaching as far as the eye could see. The sky, he said, was a very faint purple, and he could stars, upon upon stars. He also relayed that, his vision wasn't how it is when awake - an oval field of vision - so I imagine like eyes not set into a head, and that looking down, he had no body. So like pure awareness suspended in that place. He said he didn't feel scared, not in the least and that a deep calm and peace pervaded his entire being, albeit an invisible being.
As someone who believes that the nothingness, the non existence before birth, is what we return to after death, I do wonder if these hallucinations that the mind undergoes are the bodies way of making it easier?
This subject interests me, fills me with a feeling of calm, but also a real sense of wonder all at the same time. Can't help but feel that, should I take the step to CTB? Mate, what an adventure, it's the greatest step into the unknown imaginable.