昨夜（さくや、sakuya）
- last night

The Japanese word 昨夜昨夜 (さくや, *sakuyā*) means "last night" or "yesterday evening." It refers to the evening or night that preceded the current day. It typically denotes the period from the evening hours until the next morning.

⚫︎昨夜、映画を見ました。 Translation: I watched a movie last night. ⚫︎昨夜はとても寒かった。 Translation: It was very cold last night. ⚫︎昨夜、友達と食事に行きました。 Translation: I went to dinner with my friends last night.

⚫︎昨夜昨夜 is used to specify an event or action that occurred during the night or evening of the previous day. ⚫︎It is often used in conversation or writing to provide context about when something happened. ⚫︎It's important to remember that the meaning of 昨夜昨夜 assumes the "today" is the context.

⚫︎昨夜昨夜 is written using the kanji 昨昨 (saku, meaning "yesterday" or "last") and 夜夜 (ya, meaning "night"). ⚫︎The reading is *sakuyā*. ⚫︎There are no significant variations in the okurigana. The word is consistently written as 昨夜昨夜.

⚫︎ゆうべ (*yūbe*): "last night" or "evening" (more formal) ⚫︎きのうのよる (*kinō no yoru*): "yesterday night" (more common and general)

⚫︎今夜 (*kon'ya*): "tonight"

昨夜はよく眠れなかった。 ・Translation: I couldn't sleep well last night. ・Explanation: This sentence describes the speaker's experience of not sleeping well during the previous night.

昨夜、遅くまで仕事をしていました。 ・Translation: I was working until late last night. ・Explanation: This sentence indicates the speaker was working late into the night.

The word 昨夜昨夜 is a compound word. 昨昨(saku) comes from an older form of "yesterday" (or "the previous") and 夜夜 (ya) which signifies "night." This composition straightforwardly means the night of the previous day.