I remember, aged about 5, finding the pilow case of presents at the foot of the bed and being unable to contain my excitement, opening them all at about 5am, rather than waiting for everyone to get us, as we were supposed to. And then getting lots of grief as my parents tried to match the pressies to the ripped wrapping paper so that they could make sure my 'Thank you'* letters thanked the right people for the right presents!
* Have 'thank you' notes dissappeared from the young these days? We always had to write them at Xmas and birthdays, now, half our nieces & nephews don't even managed a phone call to say thanks. Oh well, that'll make their birthdays cheaper next year...