Nothing man, just feeling tired and sleepy... Specially when it's cold outside I never seem to wake up. And I can never drink coffee so I don't know what's the best solution.
It's never been like this here though during this time. You could never see people wearing a t-shirt in December/January before. Average temperature was 17 °C in the last 2 months.
From March till August is awesome here, weather-wise.