I decided last night to see if it was still possible to see the sun all night from Abisko, the midnight sun is due to the sun not dipping below the horizon and saying in the sky 24hrs a day. I'd say it has gone for this year, I suppose you could stand up high on the mountain and still see it but from the lake edge it's not visible from around 11.30pm, it's back in the sky before 1am.
Here's a view looking in to the sunset at midnight.
And turning around in the other direction looking back at Abisko. Nice skies but as you can see from below, you'd need to be a fair way up to still be seeing the sun.
Soon be winter now!