夜 is one of the most commonly used Japanese kanji, and it also has a lot of special readings in addition to the standard onyomi and kunyomi readings.
ONYOMI 音読み
よ yo よる yoru
KUNYOMI 訓読み
ヤ ya
Examples
あなたは夜よく寝れませんか。Don’t you sleep well at night?夜は早く寝ます。I go to bed early at night.夜がやってきた。Night came on.土曜の夜だった。It was Saturday night.彼は夜私を訪ねた。He called on me at night.静かな夜であった。It was a quiet night.夜は雨になるらしい。It’s supposed to rain at night.夜の間に雨が降った。It rained during the night.夜がすっかり更けた。The night was far advanced.彼は昼眠って夜働く。He sleeps by day and works by night.