You find yourself in a medically-induced coma.
You are unconscious in ICU, fighting for your life.
While days and weeks pass in the outside world, within your coma an alternate life spanning decades begins to unfold.
You hold down jobs, go on vacation, get married, have children, live life to the full.
And then you wake up back in this world.
You might wonder what's going on?
You might question your entire notion of reality.
You would be right to do so.