I'm in sourthen NZ and it's business as usual, it's just cold, dark, and miserable! Personally my life doesn't change much, I just wear warmer clothes and complain about how the sun sets before I go to work.
The summer christmas break is when everything slows down and we all relax in the sun! I usually get 2-3 weeks paid holiday at the end of the year to enjoy the long summer days with friends and family.