I'm currently sitting here, it's 10:30pm and still light outside and days will continue to get longer until the solstice in June. Such are summers in Sweden. Conversely, days during the winter are extremely short...and winter lasts a LONG time up here, or at leasts it seems to. If you want days of 20+ hours of daylight you have to be able to take the other part of year with 5 hours or less of daylight.

These drastic changes in daylight definitely affect you in a big way. Halfway through summer you'll be begging for black out shades to get a decent nights sleep and in the winter you'll be wishing for the sunlight.