The story of "Twas the Night Before Christmas" is a classic Christmas poem that tells the tale of a group of children who stay up late on Christmas Eve waiting for Santa Claus to arrive. The children's excitement builds as they anticipate the arrival of the jolly old man in a sleigh pulled by reindeer. They eagerly wait for Santa to bring them presents and fill their stockings with toys and candy. The poem captures the magic and wonder of Christmas, and it has become a beloved holiday tradition for families around the world.