Neil D’s description is spot on. What he experiences is a carbon copy of what happens to me as well. It’s good to know that I am not alone. And, despite the horrible feeling of impending death it usually doesn’t end in death. Reading how others experience these episodes repetitiously for years without incident is very comforting. I actually had my first episode in 3 or 4 years last night. Mine have come and gone for at least 25 years. However, the feeling of impending death only become part of my experience the last 6 or 7 years. For me they don’t seem to be tied to stress. I only say this because I haven’t had any occurrences during periods of elevated stress. In fact, my episode last night came at a time when I am actually experiencing a period of personal peace in my life. Many have stated that it might be related to snoring and/or sleep apnea. This could be the case however I am snoring less these days after losing some pounds over the last few months. I would be surprised if this is the cause. Of course, I could always do a sleep study but the likelihood one would occur during the study is highly unlikely. They just don’t happen often enough. I read a few places online where doctors were indicating these events might be tied to some sort of brain misfire during the initial falling sleep stage. Or, maybe a brain seizure of some kind. To me these make more sense in my case but who really knows. One last thought, I recently recovered from Covid. Spent a week in the hospital. During my follow up with my doctor he stated that I may experience strange occurrences over the next 6-12 months. Neurological issues like feelings of disassociation or being out of body. I did experience this a little bit just after recovery but always happened upon awaking in the morning. I’m wondering if this is the true culprit. Although it doesn’t make sense that I have had episodes several times in the past. But none over the last 3 or 4 years until getting Covid. Just a thought.