I was so lucky to not be struck down by jet lag. I think the secret is to return to your normal schedule as soon as possible. My first day back home was jam packed with activities so I wasn't able to go to bed at 5:30pm, which my internal clock thought should be bedtime.
I was only 30 minutes late for work and had three weeks worth of email to sort through - no time to even think about being sleepy. When the 5pm whistle blew, I went to my parents' house to celebrate my mother's birthday. After dinner out and opening of gifts, I headed to a friend's house for a going away party. I finally returned home around 10:30pm. I tried not to think about the fact that it was 4:30am in Rome. I just went to bed and thought about how in one more day it would be 4th of July and I could sleep in as late as I wanted and do it in my own bed. As I drifted off to sleep, I said a prayer thanking God for everything I had experienced and seen on my trip of a lifetime.