I was talking to a colleague who has spent the last few years living in southern Sweden (as in, hardly the most arctic conditions in the country), who described the winter months as a perpetual “jet lag” kind of feeling.
I brought that up with my partner who is from Florida (we live in NY) and she said the feeling is mutual, even though the time difference is less extreme.
There’s just something about long periods of cold and darkness that messes with peoples heads, especially if they didn’t grow up with it.