If you want just one more beer after 3 små rum has closed, there is always the pub across the street.
They have some Icelandic beers which I’ve never seen outside Iceland, and I’m sure there is other stuff in the fridge, too.
On the other hand, it is probably wiser to go straight to bed.
Ölvisholt beers are “all over” Sweden nowadays, thanks to importer Wicked Wine.