[pmontra]

Northern countries have a lot of light in summer and a lot of darkness in winter anyway. I saw the Sun setting at 23:00 in Iceland at the end of June and rising at 02:00 and pitch black in Denmark at 15:30 in December. What can DST change there?

On the other side, equatorial countries have about the same sunset and dawn all year long. Again, DST is useless.

Where DST is useful is in a place like the one I'm living at, at 45 degrees North. I'd go with permanent DST plus an extra DST in summer. Basically it's what Spain have been doing for almost a century.

It's cloudy and still reasonably bright outside here. It will be dark past 22:00. I'd take an extra hour of light in the evening and darkness until 6:00 in the morning. It matches the time people goes to sleep and wake up here.