This is something that is often reported but seems to have little research. I remember that Dave Letterman had a guy on his show in the 80s(?) that invented the

This is something that is often reported but seems to have little research. I remember that Dave Letterman had a guy on his show in the 80s(?) that invented the casket alarm for the folks that seem to be buried alive. The inventor came up with it because as memory (dis)serves it happened more than once to him. IIRC he was largely just made fun of by Dave but that fit with that style of late night tv of the time. I am curious if there is well documented cases of extended periods of “death like symptoms” that reverse as in this case. Is it poisoning? Drugs? Unexplainable? Negligence on the Dr?