@NARINGENIN I first heard about this from the ceo of wordpress (Matt Mullenweg), who coded the website while sleeping only 2.5 hours a day. I believe he said on a podcast (tim ferriss if I recall correctly) that he felt great while doing it but he had to stop when he got a girlfriend. (https://sleepreviewmag.com/curated/sleeping-6-times-day-wordpress-founder/)
In terms of complete freedom from sleep cycles, that is new territory altogether. I think it would require an intense meditative practice...
One anecdote that I can share is that, while doing a meditative practice known as "yoga nidra", I could perceive myself consciously entering sleep, and remaining asleep while still being conscious. I even dreamt during the period I was asleep.
I remember reading about this yogi called Swami Rama, who could enter sleep at will but still remain conscious. Let me know if you find anything re: useful meditative practices!