Just curious if anyone else has experienced this. I think the article is correct in saying fatigue is a factor and that it is a prelude to deep sleep. Now instead of wondering if something is wrong I now know I am about to fall asleep.
The first few times did make me wonder what was going on. Can't say it ever scared me. While I was working I had both very intense visual and auditory but only one such event per night that I can remember.
My best description of the visual is like a strobe light. The auditory has an electrical sound about it. Short duration and very intense.
Since retiring I rarely have a visual event but still have an auditory one.