I had no idea Christmas pajamas were such a common tradition!
Christmas Eve I usually help my brother with shopping that he has put off till that day. We go for communion at church with a short service, then off to the in-laws for a big dinner and presents with them. My wife is the youngest of six children, so when they are all there with their own families, it can get very busy (and loud)!
Then we go home and let the kids open one present...the pajamas...and they love it! They can't wait for their Christmas PJs. We get the milk & cookies ready for Santa, then off to bed.