Iceland is a bizarre country. Still remember the first time going. Went out for a meal on the first night at about 8 pm. Got into the city centre and everything was closed. Finally found a clock and it was 3 am. Still bright as a summers evening. Bizarre.
I used to spend 6 weeks a year up on the Arctic ice starting in April. It was 24 hours of daylight for the entire time. Really messed with your head. When you finally return to southern Canada, the first night is really cool. Also, the smell of grass is overwhelming on the first day back.