I want to put my thoughts down about this. There are two points about how to think on the matter of dying and things are related to it.
There are none-speculative parts and speculative parts.
What is none-speculative:
-Dying is ceasing of vital signs in irreversible manner.
-Near Death Experiences: they are not coming back from death. The body and the brain may go into a very low vital state but not absolute zero. The natural vital state alters between high wave (long) and zero wave (short) and when the high wave gets too low as to be close to zero wave it gives the illusion of a flat line but it is not really a flat line and then high wave comes back and the rythm is restored to normal level which gives the illusion of coming back from the dead.
-Conscience mind of the brain is known. The unconscious mind is unknown for the most part
What is speculative (part of this is my own conjectures and part is my understanding to my religion's beliefs:
1)My conjucture-The unconscious mind is like a super computer Network that is not limited by the brain which is a node that has access to that network through the interfacing with the conscience mind so when someone dies their conscience mind (thoughts, memories, feelings, personality) is not lost forever. It is stored by the unconscious mind by the interfacing.
2) According to my religions literature as to what happens to when someone dies and there are different things that could happen based on how good or bad the person is and it is a spectrum not binary:
A) Person is good: their conscience gets transported to another body in the Interstice World (inbetween The lowly world which is this life and the last world which is the eternal world) which is a dimension that the dead occupy which is similar to our world in that it has physics and biology so people wake up in a body like theirs in the past life and they eat, drink and walk, talk etc. time flow is incredibly slow In this world so 7 mins to them maybe a century has passed in our world. They are waiting to be resurrected with everyone back to this world in judgement day.
B)The wicked ones: also their consciousness gets transported to bodies in the Interstice World but in cages and being reprimanded and kept in bad conditions as they have done so to other people in their past life. Time flows incredibly fast so 7 years passed there will be like 1 minute passed in our world. They are also waiting to be resurrected with everyone for judgement day.
C) Neutral people: neither good nor bad. They remain dead as not being conscience until they are resurrected in judgement day with everyone else
D) Judgment day: every human and animal is resurrected after final extinction happens on earth and every living being dies and some period of no living activity has passed maybe million years. When everyone is alive again on this earth but everything changes and physical and cosmic laws have changed and nothing looks the same anymore. People and animals come back and recieve judgement. Blanace is restored. If someone hurt another they get what has been taken from them back and the perpetrator suffers consequences. If someone did something good for another being they get rewarded. There wicked are punished, the good are rewards, the neutral ones are examined further to show if they are good or bad and then rewarded or punished accordingly. Animals are brought back so if some human wronged them (except slaughtering for food or using them for travel, farming) then the animals see their revenge but all animals perish after they were done with getting their grievances but animals are not judged so they are neither rewarded no punished.
I am didnt write all of this for entertainment value but to share why people may think death is not the end. When you die you die that is not a speculative issue but I wanted to clarify why people tend to speculate about continuity after death.
There will never be scientific evidence for the afterlife. It is simply impossible.