The time of day when it is dark, from sunset to sunrise, especially the hours when most people sleep.
Compound word: 'night' from Old English 'niht,' related to German 'Nacht' and Latin 'nox,' combined with 'time' (Old English 'tima').
Humans are the only animals that invented artificial light to ignore nighttime, which completely changed our sleep patterns and health in ways we're still discovering—our genes expect darkness but our cities provide light all night!
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