I have been doing a lot of internet reading on this topic, to try and see if there is actually any proof of existence after death. I have been quite shocked and occasionally moved by some of the things I've read. One example is where a patient was having surgery and had ear plugs inserted giving loud pulses so they could be seen on the EEG. The patient died and all brain wave activity stopped, the EEG showed no signals whatsoever, even responses from the pulses through the ear plugs. This patient was classified as brain dead. After several minutes, they managed to revive the patient and activity returned to the EEG. What shocked the Doctors is the way the patient repeated virtually everything the Doctors spoke about when death had occurred. There was no way the patient could hear with the loud clicking through the ear plugs, let alone be able to process any senses due to brain death. There seems to be some common factors where near death occurs. First is leaving the body and floating. Second the whole idea of space and time seems to break down. The patient seems to find it natural to be in many places at the same time and comfortably process all the information. Several cases state how the patient was on several floors of the hospital at the same time, and gave accurate descriptions of what they had seen/heard. With so many cases of accurate accounts from dead patients, explaining what they witnessed either through hearing or sight, is this something which we should take as absolute evidence that life continues?
Another commonality is regarding missing body parts. Several people with missing limbs claimed they suddenly had their limbs back when they left their body. They explained that the soul is like a template of that body in perfection which cannot be damaged. When you leave that body as the soul, you are just the perfect soul without the flesh covering. I suppose this is a comfort to those considering being a donor. I'm sure that the accounts given by the patients are accurate because they are validated by medical staff. Most of the patients seem to change their perspective on life when they recover too, seeing life as precious and being far more confident that life doesn't end here.
When I was 11 years old, I had a nasty accident where I ran into a glass door. I actually left my body and could see it standing unconscious but not falling onto the broken glass still in the door. If my body had collapsed, it was obvious that my body would have been in 2 parts. I didn't see any lights, or dead relatives. I can say I was scared being alone and wondering how to get back in my body. All I remember is that I heard a scream from my body, then I was back in. I explained all this to my Doctors and they said "it's just a trick of the mind". I believed them and never thought about it again until recently (40 years later). Perhaps it wasn't a trick of the mind. The good thing about being out of my body was feeling no pain, but once returned, it was agony.
Sorry if I seem to pick strange topics 
Normally, death is a fated process that one can hardly go back. On the other hand, it is possible to see your own body from an "off body" perspective. From my study, in that case your soul is not actually off your body, you are just given a vision of your body. One of the possibility is that there are other spirits around who can manifest visions for you to "see" your own body or to hear, say, the details of what the doctors said while you are considered unconscious. You can "communicate" with the "outside" world this way because your soul is not well combined with your body, it's not actually off your body. Your soul will go off your body only after you die (a process without a return unless permitted, and when permitted most likely you will know who gives that permission

).
When you die, you are going no where but lying on the bed (presume a natural death) while remaining fully conscious. You know clearly that you are going to die, and you know that it's not dreaming because it's a quite long process and you will be on your bed all the times during the process. You can't have a dream of yourself lying on a bed (the same bed you recognize in reality) all the times. Actually one can easily tell the difference between reality and mind tricks or dreams as dreams/mind tricks are inconsistent. You are here at this moment and you will be somewhere else the next moment, that's possibly a dream. You are lying on the bed all the times without going anywhere else while thinking lastly and logically, most likely it's not a dream.
NDEs are suspicious in that they are usually inconsistent and thus dream-like. They are not death itself but physically approaching a "bodily malfunction" but they are destined not to die. Another indicator is the "spirit", you shall see it flying out of your own body before your soul can actually leave your body. Anyway, you'll be surprised by what would happen when experiencing the process called 'tasting death' in the Bible. If you would like to do an aftermath, perhaps you'll notice that only the Bible but no other books in the world could provide you with some details about what you would experience through this process called death.