I find that earplugs & an eye-mask definitely help to block out the world and get a bit more sleep.
When I can't get to sleep at home I swear by my Relaxing oil roll on, I think I got it at Boots... lavender oil is supposed to help as well.
And I agree with one of the first posters, get yourself into sleep mode... I start off as soon as I get on the plane with "resting" not doing any tv or anything to, putting my clock straight back on to European time so I see how late it is and think ok... Bedtime!