I was reading about this on the internet and there is some thought Clement C. Moore didn't write it. He didn't claim he did long after it was published anonymously and became popular. The family of the far lesser known Henry Livingston Jr. claimed their father did, but couldn't prove it. I look up at random a Livingston poem and found "The Dance Poem." This is how it starts:
The queen of Cairo, all lovely and winning
Whose blandishments ever kept Antony grinning.
The flow'r whose odors unremittingly please:
With the glory of forests, the king of the trees.
To the prince of the fairies, a jealous old knave,
Put the name of the tree that undid Mother Eve.
To finish the whole, add that period of day
When the linnet and thrush to repose hie away.
The initials of these, if adjusted with care.
Will show you the fairest where thousands are fair.
I see The Night Before Christmas in the highlighted sentences.