After-death experiences will not seem so alien or incomprehensible if you realize that you encounter similar situations as a normal part of your present existence.
In sleep and dream states you are involved in the same dimension of existence in which you will have your after-death experiences. You do not remember the most important part of these nightly adventures, and so those you do recall seem bizarre or chaotic as a rule.This is simply because in your present state of development you are not able to manipulate consciously within more than one environment.
You do exist consciously in a coherent, purposeful creative state while the physical body sleeps, however, and you carry on many of the activities that I told you would be encountered after death. You simply turn the main focus of your attention in a different dimension of activity, one in which you have indeed continuously operated.
Now, as you have memory of your waking life and as you retain a large body of such memory for daily physical encounters, and as this fount of memory provides you with a sense of daily continuity, so also does your dreaming self have an equally large body of memory.
As there is continuity to your daily life, so there is continuity in your sleeping life.
A portion of you, therefore, is aware of each and every dream encounter and experience. Dreams are no more hallucinatory than your physical life is.
Your waking physical self is the dreamer, as far as your dreaming self is concerned: You are the dreamer it sends on its way. Your daily experiences are the dreams that it dreams, so when you look at your dreaming self or consider it,
you do so with a highly prejudiced eye, taking it for granted that your “reality” is real, and its reality is illusion.”
Seth Speaks, Chapter 10 – “Death” Conditions In Life : Session 538, June 29, 1970