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If a ghost exists, why nobody return to say “hey I’m back”?
I receive this inspiration during in those so called “Power naps”. The answer is more simple than one can think about it.
When we die, for some reason we lose our everyday memory and they are replaced with false memory. So if we don’t have our memories anymore, there will be no urge to return home. The evidence is in our dreams, when we fall asleep, we lose our everyday memory as well and have false memory instead, that is why we can’t recognize a dream as a dream. Some scientist even say that the closest thing to dying is falling asleep.
As for “Ghost phenomena” to occur, some of us have part of their memory left intact(to know they are dead - they become lucid ^^), but ghosts reside in the astral plane, which is here but on a higher level. So our plane and astral plane are in contact with each other, so that is why we can’t see them clearly. And one need to have stronger energy to access our plane and disturb the folks.