1. Skepticism of “magnetic‑sleep” claims
“Really? My instinctive reaction to this statement is that it's quackery.” — eru
2. Evolutionary perspective on human sleep
“Sleep is critical to human functioning, and yet, we sleep fewer total hours than any other ape, and are still arguably the most evolutionarily successful of the primates.” — moffkalast
3. External influences on sleep quality
“More fragmented sleep, with people talking in the night, etc. I guess that's different from the low, unnatural, rumbles of cars and aeroplanes the majority of people have to put up with.” — montebicyclelo