I have just listened to the audio book for Star Rover "The Jacket" by Jack London.
This is a fictional story but based on the real life accounts of Ed Morrell (Darrell Standing) who lived out a number of years in San Quentin Prison in the 1900's and as a way to survive the tortuously tight and painful straight Jacket he was so confined to, taught himself to will himself "out of body" living out whole previous life times at a time.
This book has evoked so much emotion in me. How strong is mind and spirit.
https://www.youtube.com/watch?v=2kGGMw1cqPM