Think of it this way
When people dream their dreams may only be 24 hours but they feel longer(or shorter)
this is why people in comas may think they only were out for a night
Death is like eternal sleep so if a person falls asleep before death their conciseness may last to them even after they die
why?
Because time in dreams is relative
think of it this way
bob has a dream for one second in our time before he dies
in bobs time though it lasts forever
[spoiler]and also with quantum physics anything is possible tbh[/spoiler]
Also found this http://www.learning-mind.com/quantum-theory-proves-that-consciousness-moves-to-another-universe-after-death/
Edit2.0 No one likes my pun in the tag? LightningPhilosiphynix? anyone? *grabs Knife* Yall better start laughing real soon or your consciousness will be in another universe
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Death and sleep are not very similar. In sleep, your brain is still active. Sleep is a minor mystery, with conventional wisdom being that it is used to clean and organize thoughts. Perhaps the brain needs to "defrag" to operate efficiently, and sleep is how it does this. While this is going on, the brain still functions, and that includes dreaming. Death would mean the brain has no activity. Nothing analogous to a dream could happen inside the brain. However - who knows - learning that the consciousness can continue without the brain would be surprising, but stranger things happen in nature, such as quantum entanglement. Everything is impossible until it isn't.