I have spent a while at approx. 64 degrees North, from March till May. I was already surprised at the length of the day towards the end. The sun remained visible until after I went to sleep, around 23:00, and when I woke up during the night around 3:00 or so, it was already there again.
I have to say, although I love the North and everything surrounding it, the length of days/nights is not something I'd wish to experience long-term. Already during that short stay, I noticed it messing with my sleep cycle. And that was the light-period. I don't think I would react well to no sun over several months - even though the people there said that with the persistent snow, moon, stars and northern lights, it's not as dark as one would think. And during the light-period, I'd miss it being dark. Dark nights feel like a spa treatment for my brain.
I would love to see the polar night one day, but I don't know if I'd be suited to living up there.
What exactly do you mean by that?
I live at that latitude, now a bit farther north, and I don't experience it as something special. Days get shorter in winter, and longer in summer.
I always struggle to some extent with it being dark in winter in the morning, when I have to get up and get ready for work, and in the afternoon when I get home. Although I love the stars and the darkness, it helps me greatly to wake up in the morning if it's bright outside. I feel much more tired in the morning in winter.
Or did you mean something else by that question?