That's what people always seem to be concerned about… but the real problem up north is the eternal summer days. Enjoy never getting a night's proper sleep!
Blackout curtains don't form a good seal and always let light bleed through around the edges.
As someone who lives in Sweden, I can’t agree there.
Lights can never fully replace sunlight. It’s not even close.
I've lived in Sweden my whole life, and in Norrbotten for a decade.
And if your blackout curtains don't work, get better ones. Many Nordic households have double curtains, one solid plastic to block the vast majority of the light and the other from cloth to diffuse/block the rest and look pretty.