One of the hardest things about traveling over the holidays is adjusting to the time change (if your travels require one). The key to feeling good is to get adjusted to the new time zone quickly. One thing I suggest is to set your watch (to the new time) on the airplane before you take off (from your origin). This way you'll start to adjust to the time change well in advance.
If you're always saying, "Well sure it's 9 am here, but where I live, it's only 6am. No wonder I'm so tired...," your brain is going to have a hard time adjusting -- Especially since you keep reminding it of how offset things are. Instead of focusing on the time, focus your energy on eating healthy, exercising and relaxing.