The time difference is the key. They took an overnight flight so if they land at 8 in the morning by their watch it is 2 in the afternoon in Italy. That always was a problem for me. I leaved at 6 pm, and 8 hour flight would get me in England at 2 am my time but in England it was 8 am, I was tired for bed, but I had the whole day for business. I couldn't sleep on the plane, so I wasn't running an all cylinders. The answer, I left a day before I was to meet, thinking I was smart. It was worse, arriving tired I went to bed. When I woke up, it was evening, that was okay, but when I would normally go to bed, I was still wide awake. It takes a day or two to reset your internal clock.