noun, adverb
Refers to the previous night or evening. Often used adverbially without a particle.
昨夜はよく眠れなかった。
I couldn't sleep well last night.
昨夜のパーティーは楽しかった。
The party last night was fun.
Applies to each form listed below
Standard kanji spelling; reading ゆうべ is a jukujikun.
Kana spelling is common in everyday writing, especially when the kanji reading might be ambiguous.
Rarely used kanji form; same jukujikun reading.
The reading ゆうべ is a jukujikun (meaning-based reading) for 昨夜, combining 昨 (previous) and 夜 (night). The word itself is native Japanese, related to 夕べ (evening).