The wonderfully-named BellEnd Bob said
I find the mixture of reading/sleeping/talking/watching movies and walking will help things along.
and that does it for me. I too can't sleep on flights so I fight to get an aisle seat so I can have a potter around while everyone else is kipping.
I've flown from Sydney to London twice with just a transit. Never again. I always stop over. The first flight I tried a 'no alcohol' policy and was jet lagged for a week (I had been in Sydney for nearly two months). The second I tried a 'lets get pissed out of my brain' tactic. I was jet lagged for a week.
Good luck and enjoy your holiday!