I had not come to SF for pleasure but for work. I am not particularly fond of flying and I get a jet-lag every time. The flight from Zurich to SF takes 12 hours. Believe it or not but this time I did not have a jet-lag. The reason therefore was the angina, which came along as nasty travel companion. Thanks to the angina I slept for most of the flight, even though we departed in Zurich at 1pm. As a solution for a jet-lag not to be recommended.