Consider it also on a much vaster scale - the death of the universe at the time when all energy runs out. It will be as if it had never happened. Likewise, when you are dead, you will be as you were before you were conceived. So - there has been a flash of consciousness or a flash of galaxies. Even if there is no one left to remember.
Conscious memory plays little part in our biological existence.
And if I forget how many times I have been here, and in how many shapes, this forgetting is the necessary interval of darkness between every pulsation of light. I return in every baby born. They cover simply our actual experience, our human knowledge of facts or events.