Thank you very much for sharing this, I had not heard of this before and this is exactly in line with what I was looking for, so much depth to that practice. Do you practice buteyko personally? I'd appreciate if you have any first hand experiences to share with regards to the practice in any context, doesn't have to be sleep related.

I've both heard of and read as much as I could find on polyphasic sleep, even temporarily trying it (not long enough to bother reporting anything), though I can't manage to live a life where I could properly apply that practice yet anyway.. the consistency of the practice was absolutely key to it's success and it doesn't mesh with typical modern day life. I also couldn't find all that much about the practice, and only a few reports of people really following it for a long amount of time. Most imply severe cognitive impairment though, either through drowsiness, vivid daydreaming, inability to concentrate, etc.