My partner and I both got a horrible but thankfully short flu-ish things on a recent trip to Sweden. There is nothing worse than being sick like that somewhere that is so cold, unless it is being sick on the plane itself. I felt horrible on that flight and just slept the whole time with a blanket over my head. It was all just a big blur. It wasn't really the kind where you sneeze or cough or otherwise terrorize the people around you luckily and I tried to keep the blanket over my head to keep it dark and keep my germs to myself.