Definitely a novel. '1984' has a substantial narrative, rich character arcs, and explores multiple themes and social issues, which are typical characteristics of a novel rather than a novella.
Midnight was a long novel. In document 1, document 2, document 3, document 4, document 5, document 6, document 7, document 8, and document 9, it was clearly mentioned that Midnight was a novel, but it was not mentioned that it was a novella. Therefore, Midnight was a long novel.
Night is definitely a novel. It covers a wide range of themes and events and has a significant number of pages and narrative elements that are typical of a novel rather than a novella.
It's a novel. The story and its elements in Fahrenheit 451 are presented on a larger scale and in greater detail compared to what's usually found in a novella.