[Kenji]

You can trigger and even control this state. It's caused by deeply letting go and avoiding structured thoughts. I used to spend 2 hours per day on the train, for 5 years. I always kinda napped in the train, usually with ambient music in my headphones. At some point, I was able to go exactly between the waking and sleeping state, or lucid dreaming. It's an incredibly powerful experience, you can control anything, you are dreaming while your consciousness is fully awake. I also had one experience that could be described as spiritual or religious (though I'm none of that) that was very powerful.