Nocturnal 8 week old girl 😴

This is my baby at 3am. I exclusively breastfeed on demand without pumping or formula feeding. She is 8 weeks old and is completely nocturnal. During the day she feeds like 3 times, maybe every 4-6 hours and goes back to sleep. At night she is alert and feeds every 1.5-2 hours.

I live in Norway, so she being born in July is not very familiar with darkness since we get like 20 hours of sunlight in the summer. But, now it’s autumn and I feel like her rhythm is off.

Any advice??