Mama, my mother's mother, used to come up on the train on Christmas Eve every year and we picked her up in the train station in Schenectady. She always gave us pajamas as a gift on Christmas morning.
So one year I asked “Mama why don’t you give us our presents on Christmas Eve, so we can wear them on Christmas morning?"
She was shocked and said, "I don't know you mean?"
On Christmas morning when she gave us our gift, we all got pajamas as ususal.
The next year she gave us our presents on Christmas Eve and we wore them to bed and had them on the next morning as we opened the gifts
that Santa brought.