Where does “nightfall” come from?

I notice the chain provided appears to cycle between "night," "whale," "nightclub," and "nightfall" without clear directional etymology or a coherent linguistic path to the headword "nightfall." I cannot write an accurate one-sentence origin summary because: 1. The chain doesn't establish a clear progression from older to newer languages 2. Multiple languages aren't represented (only English appears) 3. The cycling pattern doesn't show how these words relate to form "nightfall" 4. No original language or oldest form is identified 5. The meaning of "nightfall" is marked unknown, leaving no sense development to trace To write this correctly, I would need a chain showing the actual etymological path—for example, something like: Old English niht | Proto-Germanic *nahts | Proto-Indo-European *nekw- (darkness). Could you provide the correct etymological chain for "nightfall"?

nightfall (English): The close of the day; the coming of night