Who the hell keeps their house at 68F?! 74-78 is my preferred temp but I can cope all the way to 85. But you turn that below 70 and we're gonna have a problem (both in the "I'm fucking cold, bitch" sense as well as the "do you own the electrical company or something? I didn't know you're a billionaire")
Have to agree, felt the need to wrap up warm when I was ill once, went to sleep and it was the best sleep in my life. Woke up drenched in sweat and hot as Satan's crack but the sleep and dreams were great
The ambient temperature needs to be significantly lower than body temperature though, because your body is constantly generating heat that has to be dissipated. 36 °C is too hot for a human for long stretches of time.
Edit: And the post doesn't seem to be about ambient temperature at all.
Whenever people say that 2 degrees global average temperature increase is no big deal, I usually remind them that 2 degrees is the difference from regular body temp and being incapacitated in bed.