The rule we started when our girls were little was that stockings were 'Open Season', but SOME daylight had to be in the sky before you could leave your bedroom to get your stocking and take it back to your room to chortle and gloat over, AND you couldn't, upon pain of death and dismemberment, wake up Mom and/or Dad. So, for about 8 or so years when they were little, we'd wake up to muffled squeaks and squeals and giggles coming from the other side of the bedroom doorway. The year that rule started they did get up well before dawn and get loud in the living room. Mom and Dad had afternoon naps that year... Boy, were we ticked off with them, but those were the fun years...
Now, eldest is almost 22, and lives an hour away, and didn't show up until 3:30 or so. Her stocking is wherever she put it, but NOT in our house, so her stocking this year was a small brown bag. Middle DD was home for the day, but we didn't find her stocking until long after dinner, so her stocking was a brown bag too. Youngest is 17, but is skiing up in the mountains for two weeks, so isn't home, although her stocking is here and loaded with goodies. It was a strange Christmas, all told. One kid home (she's good, but there's supposed to be three here, not just one) my mom was here for a few days and dog slow and hanging over our shoulders at all times. Food was good but much more casual than customary, so that was weird too.