>Obviously, physical work becomes harder and correspondingly less productive during heat. But I also notice a considerable degradation of mental work. Personall

>Obviously, physical work becomes harder and correspondingly less productive during heat. But I also notice a considerable degradation of mental work. Personally, I notice the first symptoms at around 25 degrees. I can manage being hot while awake, as long as I can sleep in the cold. If I'm hot while sleeping it's almost like I never slept at all.