YOU'D BETTER
WATCH OUT!

He knows when you are sleeping. He knows when you're awake. He knows if you've been bad or good, so be good for goondess sake. Are you sure this is Santa we're talking about?

So why is it a Christmas tradition, that Santa Claus comes in the middle of the night, when Children are sleeping? And why are only the good children rewarded with presents?

Even some of the most secular Christmas Traditions are rooted in the Gospel of Our Lord. Such is the case of the Christmas song Santa Claus is Coming to Town. Children are told to be good because Santa is coming and he will give a present to the good and a lump of coal to the bad. But according to the Gospel of Mark there is a greater gift for those who prepare, for those who watch.
Advent is a time of preperation for the coming of Jesus. As we prepare for the coming of the Lord we do not know the time or the place. Indeed we are warned by Mark in chapter 13:

Be watchful! Be alert! You do not know when the time will come.

It is like a man traveling abroad. He leaves home and places his servants in charge, each with his work, and orders the gatekeeper to be on the watch.

Watch, therefore; you do not know when the lord of the house is coming, whether in the evening, or at midnight, or at cockcrow, or in the morning.

May he not come suddenly and find you sleeping.

What I say to you, I say to all: 'Watch!'"