I have never lived far north, but I have visited Alaska. The endless summertime sunshine was amazing, but it kind of made me manic. When I'd call loved ones back home, they told me I sounded manic. I think it was the endless sunshine on top of excitement about being there. I was there for eight days, and I think there were only two nights that I was able to sleep for more than four hours at a stretch. It was totally trippy to be watching the 10 PM news and have it be bright as daylight outdoors.
No pictures in that link, but HOLY SHIT CAN YOU IMAGINE A SIXTEEN POUND RADISH.