昨さく夜やさくやCommon word›JLPTN1›Freq.FrequencyTop 10,000じ字FuriganaMeanings1noun, adverblast night; yesterday eveningRefers to the previous night or evening. Slightly more formal and less colloquial than ゆうべ.See also: 昨夜 (ゆうべ)昨さく夜やはよく眠