If we did that, Mom wouldn't be able to open anything on Christmas day this year.
Anyways, we open ours in the morning. One year we opened one small gift that the parents chose for us. We chose some gifts for them to open that year but they didn't open them.
Only on Christmas day if you open before Christmas day well it won't really be a surprise and you may be sorry you opened all your presents then have nothing on Xmas day to look forward to
When I was a kid my Mum always let me and my brothers open on on Christmas Eve and then the rest was opened on Christmas Day morning when we woke up.
I still now do the same thing with my children they get a small one to open on Christmas Eve which we say is something Santa Clause left early for them being so good and then the rest they open on Christmas Day when we say Santa has been for being good and going to sleep.