Daniel M. Ingram:
A bit old, but I noticed your mention of what you thought was Nirodha Lite...
Thanks, so maybe not NS. I'm admittedly not the most technical of yogis, leaning towards "getting gone" and feeling/allowing everything, not cultivating jhanas but noticing them. Relying on my notes the "strongest" experience of the mystery cessation came shortly after I had reached equanimity on 2nd path, and I was also starting to recognize 8th jhana around that time, and I was practicing a lot, relatively speaking. One night I had 7 or 8 of these mystery cessations almost back to back. The pulling the power cord analogy resonates, and then plug right back in. I'm very familiar with "regular" cessations, maybe I was just experiencing those in a slightly slower form. On rare occasions I have experienced some slowing of the visual field in particular, for example. But yeah, it was like going unconscious and coming right back. Muh muh muh my nirodha

There is another experience I referred to very briefly, it may be nothing, but it's kind of like I seem "gone" for a while. There is mainly the sense of coming back from a very deep cessation with no memory of having been anywhere. The Alzheimer's cessation. No real perception of an entrance or duration, just the exit only. It's also vaguely analogous to maybe when someone is lost in thought and then comes back, except in this case there is no lost in thought, just gone. And again the sense of booting up from a complete cessation.
Both of these things I have only experienced while reclining and both of them are extremely rare for me. No more than a dozen of each, while I would claim >1000 regular cessations.