3 ms·

Also do check the daylight graphs I posted in other comments, but here's an example from northern Norway: https://www.timeanddate.com/sun/norway/narvik https:/

• ghaff 8y ago
  In all fairness, that's northern Norway which is not where most people live. But the general point is valid. It's mostly the northern mid-latitudes where people want to optimize the clock relative to the sun for different times of year. Further north and further south, it doesn't matter as much (for different reasons).
• runarberg 8y ago
  The adverse effects of sleep deprivation accumulate. It does make sense to minimize the time you have to wake up before daylight.