I do it a couple of ways, I travel alot.
Drink before you are on the plane, when on do three stiff shots and take a sleeping pill. Get woken up by the person beside you or by the stewardess when you get to the other side.
If you cant do the above, I drink lots of water thats sweetened or juice.
When you get to the other side, to avoid a screwup in time difference, take a stiff drink and pop a sleeping pill. Force yourself to get some sleep. MAke sure its about the right time to do so, as in not the morning.