In summer, there's more daytime than anyone can use, so it feels wasteful. At the height of summer here (not quite Norway, don't forget) the sky is light by three in the morning, the sun pours in through the windows somewhere between half past three and four, and then it stays light all the way through to eleven in the evening (with the sun setting at some time after ten, though it stays light for a lot longer still because the sun goes down at such a shallow angle, so night's restricted to under four hours, and because the sun's not far down below the northern horizon, the sky's never really dark enough for astronomy. In the northern third of Norway the sun won't dip below the horizon at all, but it will graze it to the north and travel higher in the sky when to the south.
Thanks alot David for the elaboration. Very interesting indeed. So does it mean that people are used to sleeping at "night" even when there is sunlight outside at 10 in the evening. How does all this affect the sleeping pattern. I'd be interested in some comparison, viewing the differences between sleeping hours of Norwegians and people from around the equator.