By the way, I worked in sleep medicine, first as a medical tech, and then in technical support for the medical equipment. I never came across the idea that split sleep sessions was right or healthy, and never heard the sleep physicians or clinical specialists mention such a thing. It is far from "well accepted and known for decades", at least up until I left the industry in 2009 (though I spent less time with the specialists from about 2006).

Xurinos is presenting the correct scientific position; you are presenting the antithesis of science: "Yeah, you're wrong, everyone knows it and has always known it, I'm sure there's some research somewhere".