I find travelling West isn't much of a problem. The first day tends to be super long and I'll be really exhausted by late afternoon/early evening. But typically I'll power through it and sleep at like 10pm, and I'm all adjusted by the second day.

Flying East is the sucky one, I still haven't figured out how to crack it. Takes me a few days of tossing and turning around at night and falling asleep only at 3am, 4am before I can normalize.