Why Do You See A Bright Light During Near Death Experiences?

When people have a near death experience, some recall vivid images of bright lights or religious figures. Why does this happen?
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Sources:
https://www.scientificamerican.com/article/peace-of-mind-near-death/
https://www.ncbi.nlm.nih.gov/pubmed/15043643
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3644787/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3498963/
http://neardth.com/tunnel-of-light.php
http://www.livestrong.com/article/73263-signs-poor-oxygen-supply/

Tunnel Vision—Causes and Treatments

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0057620
http://iands.org/ndes/about-ndes/what-is-an-nde.html
http://iands.org/ndes/about-ndes/characteristics.html

Written by: Michael Sago https://twitter.com/michaelsago