Bulgarian Couch Surfing

I just bought my ticket to Bulgaria. I will be going with my girlfriend to meet her mother and grandparents. Her mother is very excited about our visit, as Stefka has not been home in three years. She has purchased a sleeper sofa for us to sleep on. I'm not sure if the sleeper sofa is the Bulgarian version of dowry, but, if so, I'm not looking forward to convincing the people at the Tyrolean Airlines baggage counter to put it on the plane.