Why is my bread dough rising this quickly?
My kitchen isn't unusually warm, so that can't be it

That may be so, but what is the environment of your kitchen like in comparison with Jim Lahey's when he originally produced/tested the recipe? Two major variables in fermentation are temperature and humidity (https://www.polygongroup.com/en-US/blog/the-importance-of-humidity-control-in-bakeries). All other things being equal (e.g. ingredients, technique etc.) these would appear to be the most obvious culprits.
The YouTube baker Bake with Jack (https://youtube.com/c/BakewithjackUk) stresses this point in his training videos to the extent that he states the temperature in his kitchen for all of his recipes, so that people may compensate accordingly. I don't recall any else going as far as actually stating that, but it has certainly helped me achieve more consistent results as a result.