"Anyone complaining about it being too hot in the bedroom is not just being 'a whining loser.'"

"People who sleep in hot environments have been found to have elevated levels of the stress hormone cortisol the next morning.... A study of people with a sleep disorder found that they slept longer in temperatures of 61 degrees Fahrenheit versus 75 degrees. The cold-sleepers were also more alert the next morning. The basic physiology is that your body undergoes several changes at night to ease you into sleep: Your core and brain temperatures decrease, and both blood sugar and heart rate drop. Keeping a bedroom hot essentially fights against this process. Insomnia has even been linked to a basic malfunctioning of the body’s heat-regulation cycles—meaning some cases could be a disorder of body temperature.... There is no universally accepted temperature that is the correct one, but... I will say this: 60 degrees is the correct temperature for winter sleep. Anything warmer is incorrect. If 60 degrees is simply intolerable, physically or existentially, the National Sleep Foundation recommends sleeping in socks or putting a hot water bottle at your feet. Or maybe wear a warm hat...."

From the inaptly titled "Your Bedroom Is Too Hot" — by James Hamblin in The Atlantic. If 60° is "the correct temperature for winter sleep," then our bedroom is too cold. We let the temperature drop down to 50° (and keep a window open if it's above 30°). 60° is too hot. Anyway, even if you stick to 60°, there's still the problem of summertime. Hamblin nails down 60° as "the correct temperature for winter sleep." Why isn't it also "correct" in summer? The answer has nothing to do with health and individual wellbeing. It's just morally wrong to use what he calls "a vicious amount of air conditioning."