New Years Eve

We had one of our best New Years Eve times ever.  We were invited over to the Fosters house with four other couples.  We had such a great time talking, eating, laughing and playing a silly game.  It was such a fun group of people!  All the kids made it until midnight (other than Finley of course).  Spencer just about fell asleep in my arms 2 minutes to midnight.  We thought the kids all did awesome... they played so well and it was almost a 7 hour play date!  What I don't get is how do kids stay up until midnight and then still wake up at 6am?