There comes a point in a heatwave when everything feels like hard work.

I've been feeling it myself lately. My office has been ridiculously hot. The fan has been wurringly shifting hot air from one side of the room to the other, achieving nothing other than making the heat slightly more mobile. Sleep has been harder to come by and I've felt dehydrated, sluggish and low on energy. Exercise is something that would normally help me regulate, has felt as though it might result in spontaneous combustion.

But I've also noticed something else.