In shamanism and certain yogas, Taoist yoga, claim very clearly that the purpose is to familiarize yourself with this after-death body, in life, and then the act of dying will not create confusion in the psyche. You will recognize what is happening. You will know what to do. And you will make the clean break.
Terence McKennaWe are, in fact, hyper-dimentional objects of some sort which cast a shadow into matter, and the shadow in matter is the body. And at death, what happens basically, is that the shadow withdraws, or the thing which cast the shadow withdraws, and metabolism ceases, and matter which had been organized into a dissipative structure in a very localized area, sustaining itself against entropy by cycling material in and degrading it and expelling it, that whole phenomenon ceases, but the thing which ordered it is not affected by that.
Terence McKenna