I've heard it from my niece who was in Sweden and Stocholm a week before me. But you're right, the sunset was around 20:00. Still.. I've seen things that I wanted to see and I had a great time in those four days. That's the important things, right?! ;)
Why Birka?! I didn't have any special reasons for that. In my previous trip(s), I've seen 'enough' arts, painting, sculpture etc. For Stockholm-trip, I wanted to see other things. Stockholm is (also) best known of the archipelago and Birka was mentioned almost wherever I read .. on internet/books. I thought, why not! Afterwards I enjoyed every moment and the boattrip too. The guide tour is an archaeologist and he told some nice facts about Stockholm and some untrue myths about Viking.
The funny thing.. after visiting Finnhamn and Björkö, I had a 'headache' when I was in 'crowded' Gamla Stan. After a quick tour in Gamla Stan, I went to Skeppsholmen and enjoyed the sunset there.
Fieldgate, your last post made me had to think again about Drottningholm. Fortunately on the first day, I arrived in Stockholm much earlier than I expected. I went to Vasamuséet en Skansen in the evening on that day and yesterday I had the time to visit Drottningholm.
Once again: thanks to the both of you for all of your inputs!!