Why do so many people who have lived in Scotland all their lives fail to notice it that never gets dark in summer where they live?

Even during the summer, it does get dark in Scotland, though not as dark or for as long as it does in winter. Scottish people do notice. If they have lived there all their lives, then it is normal to them, just as they know how dark it gets during the winter. It is only when you go to a completely different part of the world, that you notice the differences in sunrise and sunset times compared to where you live. Wherever you live, it is normal to you. People visiting Scotland from a completely different part of the world are more likely to notice and comment on the difference in the sunrise and sunset times and the amounts of darkness and light. To the Scottish people, it is what they are used to.