Pandemrix caused many cases of narcolepsia not only in Sweden, but in Finland too. (And other countries, but in lesser numbers)
Apparently there are two types of narcolepsia, type 1 is an autoimmune reaction against a hormone which regulates wakefulness and sleep. Pandemrix caused the type 1 in some people.
The whole situation is quite well known in Sweden and Finland. Over the years, there have been news articles and documentaries on TV, and so on. It is very sad to see young children injured for life because of a vaccine which was supposed to be safe.
The majority of the cases got symptoms in a few months, but some after 1.5 years.
To crown this whole debacle, internal GSK documents with signals of safety concerns were ignored (Pandemrix adverse effects were compared to an almost identical vaccine called Arepanrix). [1]
I took the Pandemrix back in the days. I'm definitely not an "anti-vaxxer", but sorry, I won't be the first in line for another rushed pandemia vaccine.
[1] https://www.fiercepharma.com/vaccines/glaxosmithkline-fails-...
Edit: reword sentence