Memory playback - of fake memory

Another realistic dream that convinced me so well that when I woke up I was surprised and took a short while to see that I was sleeping.

In the dream my memories of being younger were played back and it felt like yes these were my memories but of course it was fake but my sleeping brain didnt know until I woke.

Before waking I was exploring the idea of memory playback and was trying to learn how to do it.