How does sabbath work in Alaska?

I am sorry if this is not the right place to post. My understanding is that the sabbath (Shabbat? I’m sorry if I’m not using the correct term) begins at sundown on Friday and goes till sundown on Saturday. Are there any special rules for places like Alaska where some towns don’t have sunlight for several of the winter months? Or for when sundown is just really late in the evening? I’m just curious to know.