Polar Night

We put the clocks back in Britain overnight, so we got an extra hour of sleep. Anyway, in the Arctic regions, it is the beginning of Polar Night. Four months of continual dark. (obviously, those who are in Antarctica, it will be the beginning of four months of continual daylight).

Any SWers from those regions that experience continual night for months and continual daylight (in summer) for months? What is it like?