Meaning
The kanji 夜 means night or evening — the dark hours between sunset and sunrise. It turns up in everyday conversation, song lyrics, and train announcements alike. Japanese children encounter it in second grade, and it never really leaves the language.
Etymologically, 夜 is a pictographic-ideographic compound. Its bottom component is 夕 (evening, dusk), which depicts a crescent moon — a sliver of light against a dark sky. The full character evolved over centuries to represent deeper darkness, as opposed to the brief twilight of 夕 alone. The upper strokes suggest a person taking shelter, reinforcing nighttime as the hour when the world goes quiet and rest begins.
Picture it this way: a figure hunched under cover (the top strokes), with a crescent moon (夕) low at their feet. Someone hunkered down while darkness settles in. That image is 夜.
夜 takes 8 strokes and is taught in Grade 2 of Japanese elementary school. Its radical is 夕 (evening), which ties its form directly to its meaning — and helps you recognize the same idea in related kanji.
Readings
On'yomi (音読み) — Chinese-derived readings
The on'yomi reading is ヤ (ya), drawn from the ancient Chinese pronunciation. It appears mainly in formal compound nouns (熟語, jukugo) rather than everyday speech — the kind of words you'd find in news headlines or on official signage.
- 夜間 (yakan) — nighttime, during the night (e.g., 夜間学校 = night school)
- 深夜 (shin'ya) — late night, the dead of night (after midnight)
- 夜行 (yakou) — traveling at night, nocturnal (e.g., 夜行バス = overnight bus)
- 昼夜 (chuuya) — day and night, around the clock
- 夜景 (yakei) — night view, nightscape (the glittering city lights seen from a hilltop)
Kun'yomi (訓読み) — Native Japanese readings
The kun'yomi readings are よる (yoru) and よ (yo) — the native Japanese words for night. よる stands alone as a noun; よ surfaces in certain compounds and older, more poetic expressions.
- 夜 (yoru) — night (standalone noun: 「今夜はきれいですね」 "Tonight is beautiful, isn't it?")
- 夜中 (yonaka) — middle of the night, midnight
- 夜明け (yoake) — dawn, daybreak (literally "night opening")
- 夜更かし (yofukashi) — staying up late, burning the midnight oil
- 今夜 (kon'ya) — tonight, this evening (one of the most common words in daily speech)
Common Words & Compounds
夜 anchors a broad range of vocabulary — from casual time-keeping to vivid natural imagery. Here are the most practical ones, grouped by theme.
Time expressions:
- 夜 (yoru) — night, evening
- 今夜 (kon'ya) — tonight
- 昨夜 (sakuya / yuube) — last night
- 深夜 (shin'ya) — late night, after midnight
- 夜中 (yonaka) — middle of the night
- 夜明け (yoake) — dawn, daybreak
- 昼夜 (chuuya) — day and night
Activities and lifestyle:
- 夜更かし (yofukashi) — staying up late
- 夜間 (yakan) — nighttime (used in compound nouns like 夜間学習)
- 夜勤 (yakin) — night shift (at work)
- 夜行 (yakou) — night travel, nocturnal
Nature and scenery:
- 夜空 (yozora) — night sky
- 夜景 (yakei) — night view, nightscape
- 夜風 (yokaze) — evening breeze, night wind
- 夜露 (yotsuyu) — night dew
Example Sentences
夜は静かです。
Yoru wa shizuka desu.
The night is quiet.
今夜、一緒に食事しませんか。
Kon'ya, issho ni shokuji shimasen ka.
Would you like to have dinner together tonight?
昨夜はよく眠れませんでした。
Yuube wa yoku nemuremasen deshita.
I couldn't sleep well last night.
夜中に電話が鳴りました。
Yonaka ni denwa ga narimashita.
The phone rang in the middle of the night.
夜空に星がたくさん見えます。
Yozora ni hoshi ga takusan miemasu.
You can see many stars in the night sky.
彼女は夜更かしする習慣があります。
Kanojo wa yofukashi suru shukan ga arimasu.
She has a habit of staying up late.
深夜にコンビニへ行きました。
Shin'ya ni konbini e ikimashita.
I went to the convenience store late at night.
夜明けまで勉強しました。
Yoake made benkyou shimashita.
I studied until dawn.
父は夜勤なので、朝に帰ってきます。
Chichi wa yakin nanode, asa ni kaette kimasu.
Because my father works the night shift, he comes home in the morning.
この映画は夜の東京を舞台にしています。
Kono eiga wa yoru no Tokyo wo butai ni shite imasu.
This film is set in Tokyo at night.
Related Kanji
- 昼 — Daytime, Noon, Midday (Kanji N4)
- 夕 — Evening, Dusk (Kanji N4)
- 明 — Bright, Clear, Light (Kanji N4)
- 地 — Ground, Earth, Land (Kanji N4)
- 春 — Spring (Kanji N4)
- 暑 — Hot (Weather), Heat (Kanji N4)
Memory Tip
Find the hidden story inside 夜: at the bottom sits 夕, a crescent moon — faint light in deep dark. The top strokes resemble a hunched figure with a wide brim hat, taking shelter for the night. Moon rises, traveler rests: 夜.
For Vietnamese learners, tie it to the Hán-Việt reading DẠ — as in dạ hội (a night gala) or dạ lan (night orchid). Same Chinese root, same meaning. Spot the 夕 crescent inside a kanji, and you're usually somewhere near evening or night.