OK, you could also read a serious neuroscience textbook, but that seemed a less reasonable thing to expect of anyone. The basic point remains true though.

Tunnel vision is a tunnel, in your vision, associated with death. Since I'm talking to people who will latch on to anything at all similar to a tunnel in reports of experiences, and say "See! Commonalities!", this is sufficient to explain why a lot of the nearly-dead throughout world history have involved something tunnel-like somewhere in their reports.

I don't know who is reporting a "tunnel of light" specifically. I would expect that belongs to a post-1970s culture of near death experiences that's part of the rest of the culture of Forteana and the Mysteries of the Unexplained.

When talking about what evidence supports, really we're talking about the opposite: which theories evidence falsifies, and which surviving, falsifiable theory is the most parsimonious. Falsifiability matters, and parsimony matters. Otherwise, you can imagine what you like, but it carries no weight as an explanation.