Alien Tech
There's a lot of people whose experience leads them to think this is alien technology, but I think it's very old and this is nature's way.
There's a theory that the end of all war will be when 1% of the population is always meditating. So, what is deep meditation other than simply journeying into your unconscious mind?
A schizophrenic is caused by the veil between the conscious and unconscious mind becoming damaged, and so they're in their unconscious minds every waking moment.
Coincidentally they're 1% of the population. So nature's making a way, and they need to know how to stabilize.
That's it. Pretty simple.