Wow what a blast from the past. Sounds like /r/Tulpas. I've always thought it was a purely rhetorical trick + disassociation, and obvious what is happening and why. Sleep deprecation has always been part of it since that makes it harder to notice the errors at the edge of your perception. It goes back to at least the 2010s I think.
There is some precedent; the Twin Flame cult coerced transition in some members if I remember correctly. My guess is it was emotional manipulation used to make them do something that makes them more vulnerable to control. If you transition and you are not trans, you are going to have a hell of a lot of dysphoria, and shaming people and telling them it's because they are not trying hard enough/a good enough person/etc. would absolutely make it hard to break away.
The specific technique here is unihemispherical sleep. Stimulating one side of the body while resting the other (one eye closed) to get one hemisphere to fall asleep. I think Gwen originally developed this trick to probe the mind and see if behavior was altered when one hemisphere was asleep versus the other.
However, it turns out that when you do this, the brain as a whole does not get adequate sleep, even if you alternate hemispheres. People had symptoms of sleep deprivation while still being semi-functional. Ziz took if a step further and had some sort of secret initiation process where both hemispheres were trained differently to produce multiple personalities. At least that was the assumption from those of us on the outside gathering scraps of info being dropped.
Get you 8 hours of sleep everyone. Sleep is important.
Please note that there's no real evidence that single-hemisphere sleep is a thing in humans. Some sleep researchers suggest that a brain hemisphere can spontaneously be awake during ordinary sleep in "unfamiliar" places, and that this can be a cause of poor quality sleep - but that's a very different thing from what Ziz claims to be able to do.
Also, to the best of my knowledge, Gwern has never written anything on his site about this purported single-hemisphere sleep, see https://gwern.net/doc/zeo/index for the details of what he has written about.
Gwen, not Gwern. Gwen Danielson, if he is still alive, is wanted for his possible involvement in multiple homicides related to the Ziz cult. Not Gwern.
And unihemispheric sleep (Gwen’s word for what they do; they like to invent their own terms) is one of the techniques the Ziz cult uses.
Thanks for correcting that mixup! So there's no source whatsoever for this bizarre notion other than the Zizian death cult itself. That makes it even crazier that some people (whether here or in the news media) seem to be taking it at face value, though.
I am uninvolved (thankfully, not many people have been confused) but on the topic of the meditation practice: years ago when reading the zizian.info writeup, I found the unihemispheric sleep part to be the most alarming & interesting part.
There are many strange altered states of consciousness found by experimentation, and I can totally believe that some form of auto-hypnosis + sleep deprivation - which would parallel many well-attested mind-altering practices in many different cultures & religions - could have bizarre effects or induce psychosis and hallucinating demonic entities, and turn an activist vegan into a murderer. (Their specific interpretation of 'unihemispheric' sleep may or may not be true. I would say that it's worth checking... except I'm not sure how one could either prudently or ethically investigate it, given the apparent consequences.)
And it would answer the question many people have been asking about how these unlikely-seeming murderers were made, in a way that the rest of it all does not.
Generally I think it's good to take people's reports of their unusual mental experiences at face value, even when they're crazy. Not that they never lie, but that you learn more by assuming they're probably telling the truth.
I haven't attempted unihemispheric sleep, and it sounds like a phenomenon that isn't represented in the literature, but it also sounds like it wouldn't get past an IRB anytime in the last decades, so I assume it's probably real.
The technique might have 'merely' prevented deep sleep due to interruptions; similar to why uberman[1] doesn't work.
When I was younger I stayed up to see what happens. The worst experience of my life was when I lied down to sleep and felt 'too tired to go to sleep' and then started hallucinating sirens. I have no idea how long I was up; after a few days I lost track. I had to paced to stay awake, which I did the entire time. I got pronounced disassociative symptoms - which I'm prone to anyway - ("it's not me in control of my body; there is a mutiny", "my reflection is weird/scary/different; that is not me", "the lines that make up the walls and reality don't seem to lay correctly"), gaps in memory, broken pattern matching (everything looks like a spider, chasing down mundane sounds to figure out what they are), and mixing up memories and imagined thoughts (e.g., fill up a cup, go to drink from it, it is empty and I'm not sure if I filled it up and then drank from it or imagined filling it up or if my memories are out of order).
Given the loss of contact with reality, I could see it being easy to manipulate people if you are in the room with them. I was alone, but if someone told me another me talked to them and then drank from the cup, the mix up could easily seem like evidence that it had actually happened that way, especially if I was trusting, vulnerable and open-minded. And once someone has a model that suggests that, they would probably make up stories on their own to support it.
So, yeah, definitely agree on the importance of sleep.
I would guess he probably just convinced a roommate or friend they need to kill other people to accomplish their lofty goal, which would be a lot simpler (see: the Mangione fandom). Once he got a couple people to agree the rest came over from peer pressure.
This might be a different thing with the same name, but on 4chan's /x/ (paranormal) board there have always a lot of people trying really hard to summon a tulpa to be their ghost waifu. For a lot of them it's an ironic meme but I'm pretty sure some of them are serious and do it because they (perhaps correctly) believe it's more likely to work than talking to women that actually exist.
There is some precedent; the Twin Flame cult coerced transition in some members if I remember correctly. My guess is it was emotional manipulation used to make them do something that makes them more vulnerable to control. If you transition and you are not trans, you are going to have a hell of a lot of dysphoria, and shaming people and telling them it's because they are not trying hard enough/a good enough person/etc. would absolutely make it hard to break away.