Well that leaves us in a bit of a delima, how to you test the theory? What does it mean when someone actually ceases to breathe and their heart stops in this dream world? What about the crazy dreams we have while in this dream world? If the laws of nature don't apply while you're dreaming (I've flown in dreams, ran through walls, etc) then why can't I fly right now dammit.
death is defined as lack of brain acitivity, amongst other things, and most definitelly does not mean that you have any kind of conscious time left, trust me. a flat eeg is very terminal.
*puts on thinking cap* I think it's just a dream-like flashback/overview, then when that's done, you go on to your afterlife. Maybe you're already in heaven/hell while the flashback is 'playing' and then once it's done you kinda 'wake up' there?
If it doesnt turn on, you're asleep.
At least that's what "waking life" taught me.