I post this below, but I would say at the same time just because science doesn't have an explanation for something doesn't mean it doesn't exist still applies. In other words, maybe there's a scientific explanation but we got it wrong.
But like I said, there is way too much that I have read to not think there is much, much more to what we currently understand.
https://pmc.ncbi.nlm.nih.gov/articles/PMC6170087/
Given the extraordinary memories I had of my time deep in coma, the emerging picture of the entire experience proved impossible to explain as a simple brain-based phenomenon (i.e., as a hallucination, dream state, drug effect, or confabulation). Our modern understanding of the role of the neocortex—the outer surface, or human part, of our brains—holds that it is necessary for the detailed construction of consciousness, but the extreme severity of my meningo-encephalitis rules out the participation of my neocortex in generating memories during those seven days. Thanks to its preferential destruction of the neocortex, severe meningo-encephalitis is, essentially, a perfect model for human death. That fact would nominate the disease for widespread study in brain and consciousness research, save for one problem: it almost always results in death. Almost no one returns to tell the tale.