Something's been bouncing around more crazily than Barnaby Joyce and it's keeping me awake at night.

At first, I suspected it was something I'd eaten. Had the curry I'd had for dinner woken me in the dead of night in a warm sweat? Surely not.

Investigation revealed it was the temperature. On Sunday night, it dropped from 18 degrees at 9pm to 16.6 at 9.30 to 15.3 at 10.30. Nothing unusual here. Then at 11pm it began to rise again to 18.4 at 12.30am, then 21.3 at 1.30 before dropping again and rising once more in the hour before sunrise. A yo-yo, I tell you, messing with my circadian rhythms.

The likely culprit is a sudden stratospheric warming event over Antarctica in September which saw temperatures rise by up to 30 degrees over the South Pole. It's a rare event in the southern hemisphe

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