Yep we do the 2 stocking trick also, and wait until theyre asleep. Although its annoying trying to do, if they wake early I tell them they can play with their stocking bits until a decent hour and then we go downstairs for presents anytime from 7 on. You can always say that if you go down too early then he mightnt have been yet, and snuggle them back in to bed to read or draw, age dependent obvs