It's non-fiction. Wiesel wrote Night to share his personal and harrowing account of the atrocities he witnessed and endured during that tragic time in history.
Definitely not fiction. 'Night' is a poignant autobiographical narrative that provides a raw and unfiltered look into the horrors of the Holocaust as witnessed and endured by Elie Wiesel himself.
Well, to determine if it's fiction or nonfiction, you'd need to look at elements like whether it's based on real events or made-up scenarios. If it's based on real people and events, it's likely nonfiction. But if it's imaginative and created from the author's imagination, it's fiction.