This question certifies that during death, you don't observe reality in the same manner as you did, as that would mean you would be alive.
Therefore you would be perceiving reality through a different dimension exclusive of the concept of 'self'.
Although if you believe that during death everything ceases, then would reality exist or not? If a separate conscious entity is still perceiving reality while your dead, it would be paradoxical.
Think of all those people stuck in the psychiatric ward claiming this to be true. They know its real , but haven't discovered how to access these yet . I bet the person that came close finding them died from jumping off a 10 story building hoping to pass through the concrete ,. Think about it !