If you think everything is a simulation… how would you determine if you're alive or dead? What details would you look for?

This is a question that has been plague-ing my mind for days. But first, let's imagine a scenario:

• You were alive
• You died
• But… when you died… you (have / had) no clue you died… because, the simulation just continued on… i.e., you don't remember transitioning from the world of the living… to… the world of the dead (A-K-A the afterlife)
• So, you are currently in the world of the dead and everything looks and feels the same, as it was, in the world of the living.
• What are some key details or differences, you would look for, to determine which "reality / world" you're in?
• I am also going to remind you of 3 movies which coincide with the idea I'm presenting here: The Sixth Sense, Beetlejuice, and the TV show "Lost"…
• In these 2 movies, and that 1 TV show, the people didn't know they were dead. It took them some time to figure it out… and that's EXACTLY why I'm asking you this…
• Let's also consider this: When you were born, it was a traumatic event. An event so traumatic, that your brain chooses to not remember it.
• I can only imagine that… if you were to die, your brain (conscience) would do the same thing again… i.e., dying was such a traumatic event, that your brain (conscience) chooses to not remember that event either.
• How would you know the difference, if both "worlds / realities" are identical, and you don't remember dying… i.e., that transistion?