I've heard the theory that in the next life, next level that vibrates at a higher frequency or whatever, the sentient entities including the occasional human spirit cannot experience sensations including sex and effects of alcohol and drugs, nor food, which is what makes them and other critters like demons so interested in "jumping:" or possessing people from time to time. Also that the actual number of human spirits that haunt locations is fairly small, and a sort of electromagnetic bleed-through from Purgatory, sort of like how on a shortwave radio one can pick up a faint version of a station on a frequency of a harmonic, like half and twice the frequency.
There is the physical body, there is the electromagnetism, gravitation and some je ne sais quoi that hold it together that return to the environment, and then the sum of the intellect, emotion and memories, that last of these three is the entity in question. In addition and somehow connected to it that there is the being folks call the soul that goes somewhere, and finally a divine spark that goes back where it came from. The third and fourth component may have to go elsewhere or back to earth and accomplish something specific in atonement -- and it could be as an animal or something else too -- if the owner was awful to people, scandalously wasteful, or whatever. Someone who trucked with transcendent evil to really create large scale problems, like Hitler for example, may just goad whomever is in charge of all this to just annihilate everything left of that individual, which from their perspective may look like blackness but also hurts like the dickens and time stops, which could be one implementation of Hell. I did hear that there was an archangel who went down to the one with which people are familiar and cried his or her eyes out until it put out the flames, so the people who are there for the time being deal primarily with crushing boredom and all the angst of a realm not governed by the law of cause and effect.
Or, maybe the lights just go out?
What we do know with certainty is that many, many, too many people are living out their Hell here on earth.