The narrative begins on a tranquil Christmas Eve, characterized by absolute silence where "not a creature was stirring, not even a mouse." This setting establishes a sense of domestic peace as the family prepares for the arrival of St. Nicholas, with "stockings hung by the chimney with care." The children, "nestled, all snug in their beds," are dreaming of "sugar plums," setting a magical and expectant tone for the night.
The serenity is suddenly interrupted by a "clatter" on the lawn, prompting the narrator to spring from bed. Upon rushing to the window, the narrator witnesses a scene illuminated by the moon, which gave the "lustre of midday to objects below." What appears is a "miniature sleigh and eight tiny reindeer," signaling the arrival of the legendary figure. The narrator immediately identifies the driver as St. Nick, describing his movements as "lively and quick," mirroring the speed of "eagles."
The reindeer—Dasher, Dancer, Prancer, Vixen, Comet, Cupid, Donder, and Blitzen—are described as moving with incredible agility, rising "to the top of the porch" and eventually to the roof. The narrator hears the "prancing and pawing of each little hoof" before St. Nicholas descends "down the chimney... with a bound."
The physical description of St. Nicholas is iconic, capturing the essence of the holiday spirit. He is depicted as a "chubby and plump, a right jolly old elf." Key descriptors include:
Despite his appearance, the narrator notes that "a wink of his eye" provided immediate comfort, ensuring the narrator had "nothing to dread."
St. Nicholas operates with efficiency and purpose. He speaks "not a word" but proceeds directly to his task of filling the stockings. After completing his work, he signals his departure by "laying his finger aside of his nose" and giving a nod before ascending back up the chimney. The departure is swift, with the sleigh and its team flying away "like the sound of a thistle." The poem concludes with St. Nicholas exclaiming a final, iconic blessing: "Happy Christmas to all, and to all, good night."