I was really responding to the article’s odd claim of 18 C being the perfect sleeping temp, and your comment was so extreme in the make-it-cold direction that

I was really responding to the article’s odd claim of 18 C being the perfect sleeping temp, and your comment was so extreme in the make-it-cold direction that it seemed to be a good spot to reply. If we’re talking about “optimum” sleep temp as though such a thing has meaning beyond personal preference, then clearly it must not be cluttered with cultural detritus like depth of blankets, etc. My wife wants it to be 20 C or lower and sleep under two blankets. I pointed out that 23 with a fan and a sheet is less energy-intensive and gives equivalent results, and she said stuff it. Not a battle worth fighting at home, but on the internet… (Of note, the one of our dogs that loves me but worships her still sleeps next me every night, under covers, because she’s a Chihuahua and gets cold easily, and unlike my wife I sleep like a dead log.)