Consciousness beyond death can be explained without reference to either superstition or spirituality.

Scientists have not definitively explained the existence of consciousness. Many maintain that consciousness is an emergent result of complex mental activity. Many also disagree with that conclusion. I will stipulate it as true for purposes of this discussion.

Consciousness, in general, can be explained as an emergent result of brain activity, but that does not explain the unique individuality of a specific consciousness. Who is the "you" experiencing "your" individual consciousness rather than someone else's, or none at all.

Why do you experience the world from the specific perspective that you do? Why do you exist to experience at all?

Assuming there is no experience beyond death (or before birth), it would be as if the universe did not exist for you before you were born and will not exist for you after you die. You will "experience" total oblivion - no matter, energy, space, or time will exist for you. If you were never born, the universe would never exist for you; you would "experience" only endless oblivion, that is, no experience whatsoever.

At one moment in time, a sperm cell united with an ovum and grew to become you. Before that occurred, you existed as a potential. The potential you became the actual you. Why did this particular sperm/ovum union become you rather than becoming some other potential individual? Why did you manifest as this particular union rather than some other union? Why do you experience consciousness at all, rather than oblivion.

Scientists have no answer to these questions. Can scientists ever answer these questions? I don't know. But, as long as science has no answer, the answers are open to speculation. If your individual consciousness became manifest from a particular sperm/ovum union at one particular time, who is to say that after your death, at some future time, the same consciousness, your's, might not once again manifest from a sperm/ovum union?

If that were to happen, then indeed, you would experience a life after the end of your current life.

You will note, there is no supernatural or spiritual event being suggested. It is a rational speculation of a possibility.

Is your life a single, brief flash of light between two eternities of oblivion? Or could more flashes occur?