I may not be a doctor, but I think I have mastered jet lag (at least for me). I try to adapt to local time ASAP. For example, if you're taking a long red-eye flight and arriving early in the morning (for example, Australia), instead of going to sleep when you arrive, go out in the sun (or somewhere bright), and get some exercise or keep yourself busy so you won’t fall asleep. To help get adjusted, I set my watch to local time as soon as my plane takes off. Once I arrive, my goal is to stay awake until at least 10 p.m. The first night of sleep is crucial for me, because it sets the pattern for the entire trip. That first night I sleep with an eye mask and ear plugs, so I won’t be disturbed. For more information, check out this jet lag calculator that advises people when to seek and avoid bright lights.