When A daughter was little - she never slept very soundly and would always wake up at night when the slightest noise was made.
This was my biggest fear come putting things under the tree on Christmas Eve,
That she would indeed wake up.
My fear came true one Christmas Eve-
I had just placed the presents under the tree when I hear miss 3's voice behind me-
I freeze
And trying to think on my feet I whisper with hast and usher her quickly back to bed-
"Quick back to bed - Father Christmas is still here - he's gone out to get more presents"
At that point my husband had realised what was going on-
So thinking on his feet he grabs a little bell that we've got-
Goes outside her window shakes the bell and says/goes "Ho ho ho" in his best Father Christmas voice

So my daughter accepting the fact that Father Christmas was still here and that if she peaked she'd get less presents went back to sleep

I still laugh to this day of A dad having the thought of going outside her window and doing that - was hillarious !
Ahh kids - got to love them!