DST only really makes any sense at mid-latitudes. If you go close enough to the poles it just seems silly to move around that hour - does it really matter if the sun is up from 2 AM to 10 PM or from 3 AM to 11 PM?
DST is completely silly as far north as the Nordics. The rate of change in daylight is so rapid around the equinoxes, that the effects of DST are erased in less than two weeks. It's completely useless.