Yes Fenwick seems to be interesting on this. But has he really got anything more than a series of anecdotes of subjective experiences, with some common features?
The one that interested me was the "experience" of people who showed "flat line" on EEG's,
meaning their brain was completely stopped.
Also statistics from people in the care industry on these phenomena.
Three people in my own family have had these experiences, one of which is the rare (?)
Sympathetic Near Death Experience. This particular one demonstrates that the Near Death
Experience isn't necessarily brain breakdown - as it's experienced by someone close to the
dying person who's brain is perfectly well.
Fenwick is also a neurologist.
btw - I see any religious connection here - it's just super interesting. I should know, went
through the experience myself.