NDEs go back to ancient Greek records. Also the old RCC has them. The Muslims consider them blasphemous.
NDEs became prolific in the 20th century, especially with advanced resuscitation and so many surgeries. Hypoxia is not an adequate explanation.
Many documentaries and books have been written by Drs and experiencers. I read My Descent into Death by Howard Storm and contacted him. I can ask if you want his number. I read Embraced by the Light by Betty J Eadie. They also have videos along with Colton Burpo's story.
Then there are general books written by Drs like 1975 Life After Life by Dr Raymond Moody, in which he first documents commonalities. Go up the tunnel of to a great light, meeting the being of light, also identifies sometimes as Jesus. Being asked, "Do you love me, what have you done for your fellow man?" Asked without spoken words. And the life review, with strong feelings of how you made other people feel.
Meeting old friends and family, or saint Francis.
A countryside with intense beauty, supernatural light, a border of no return. There is a difference between the country and the city, with it's beautiful gates, buildings and inside there is the throne.
Some people see a river. There is music. Streets paved with gold.
Colton aged about 4 recognized his grand father, from pictures of him in his youth.
I think these accounts have become a genre of writing and people now make them up. So stories from pre-2000 are better.
There is IANDS and near-death.com They have accounts from all religions and many countries, and children's...
Ivan Rudolph in Living Beyond explains hallucinations from real NDEs, Heaven from paradise and purgatory from Hell. Benefits, other religions...
So people since 1920 say, until now and 1 in 20 have had an NDE, seen the light or horror. That's hundreds of thousands. In Psalms testimonies are prized.