Shelley's sister stayed overnight (and helped us assemble the new kitchen playset we got for the kids) and of course, the night was rocky. Attuned to the worldwide restlessness of children on Christmas Eve, Kai was up at 3:30. With a houseguest in the room below his, we didn't feel justified in letting him cry himself out and spent a couple hours with him in the rocking chair.
Rei also woke up during this time and announced "she couldn't sleep". Things finally settled down at 5:30 and we all slept in until 8:00.
The lack of sleep did not factor into their determination to play with their Christmas toys.