Gothemburg is the second largest city in Sweden. I had to travel to Gothemburg for business exactly at the day which is the longest day in year. At this time, the it is not getting really dark in the night.
First, I thought it can not be so bad, that you can not sleep. But I really could not sleep with with open windows. In the middle of the night it is so bright in the night, that it is not possible to sleep. Must have to do something with the human hormones. I woke up ever and ever until I decided to darken the window. Really fascinating, at 10 pm it is still so bright, that you can read a newspaper outside.