I'm not entirely convinced by the knowledge that is being handed to you. Yes, it could have very well been a hallucination, but there is a gray area where we have to discern if it was a true hallucination or not. Afterall, much of our belief systems have been founded on incidents like these that blur between science and myth. In my experience, I find them to often be one-in-the-same.
Your instincts and reactions are often more telling of what is happening than we'd all enjoy. Do you have reason to believe that someone has visited you? Any dead relatives or friends you were very close too?
It is not far fetched. The light could be anything so we won't speculate on that, but your own personal emotions and what was going on in your heart and mind at that moment, may tell us a lot more of what is going on. I myself have been visited numerous times in such a fashion, both by succubi attempting to prey on my sexual insecurities and by the Shadow People.
We can discuss more if you like here, or, you may message me personally if you so desire, and I can do my best to be as impartial, and as logical, as I can be for your problem. The cards might even have much to tell about this...