The weather has taken a turn for the worst and 'they' say it's going to be bitterly cold this Christmas. On this side of the pond by 3pm it's already getting dark, giving an illusion the day has already ended. If you're a 'nine to fiver' you can get caught in that cycle of wishing your life away in the rat race cycle of wake>>work>> home>> sleep. If care is not taken one could start to feel rather 'low' and presenting SAD syndrome.
A quick copy and paste job from Google defines "Seasonal affective disorder (SAD) as a type of depression that comes and goes in a seasonal pattern. SAD is sometimes known as "winter depression" because the symptoms are more apparent and tend to be more severe during the winter. The symptoms often begin in the autumn as the days start getting shorter. They're typically most severe during December, January and February.