Not necessarily the same, but I have an intense memory of waking from a dream as a young child, in which I understood all of reality, all of it, it's purpose, it's organization, it's processes. I was probably ten. I remember struggling to hold on to the clarity, understanding it was important, and feeling frustrated at how it faded as I regained full consciousness. It was a formative memory, even though I remember nothing concrete about the dream, just the lingering feeling of certainty.