Is Elie Wiesel's Night written in first person?

yes, it is a story written about his experience at concentration camps during the Holocaust

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The book is written from his perspective. Instead of saying things like "Elie was horribly mistreated in Nazi concentration camps", he says things like "I was horribly mistreated in Nazi concentration camps". So it's written in first-person perspective.

It's called first-person because it's like he is "first person" to know about it, while a third-person sentence ("Elie was beaten for accidentally witnessing an officer having an affair") is called that because it's like the narrator is the "third person" to know (after Elie and the officer). You don't count the number of people involved though, the terms have to do with how it's described, but that's the idea of it. So "the water molecule vibrated" is still third person, even though there aren't any people involved at all.