How to say “lack of sleep” in Japanese | 寝不足 (ねぶそく、nebusoku)

The Japanese vocabulary「寝不足 (ねぶそく、nebusoku)」means “lack of sleep.” Please learn the pronunciation and the example sentences.

Japanese Vocabulary and the Meaning

Key Word寝不足
Hiraganaねぶそく
Romaji Readingnebusoku
English Meaninglack of sleep

The Correct Japanese Pronunciations

Please learn the pronunciation by watching the attached video. You can also learn example sentences.

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The example Japanese sentences

It is important to have skills in both non-honorific and honorific languages in order to use Japanese correctly.

I’m not getting enough sleep.

Plain form:

寝不足ねぶそくだ。
Nebusoku da.

Polite form:

寝不足です。
Nebusoku desu.


My child cries a lot at night, so I’ve been lacking sleep.

Plain form:

うちの夜泣よなきがひどくて寝不足だ。
Uchi no ko no yonaki ga hidokute nebusoku da.

Polite form:

うちの子の夜泣きが酷くて寝不足です。
Uchi no ko no yonaki ga hidokute nebusoku desu.


I couldn’t sleep because I was nervous, so I didn’t get enough sleep.

Plain form:

緊張きんちょうしてれず、寝不足ねぶそくだ。
Kinchō shite nerezu, nebusoku da.

Polite form:

緊張して寝れず、寝不足です。
Kinchō shite nerezu, nebusoku desu.


I studied late yesterday and I’m sleep deprived.

Plain form:

昨日きのうおそくまで勉強べんきょうしていて、寝不足だ。
Kinō osoku made benkyō shite ite, nebusoku da.

Polite form:

昨日遅くまで勉強していて、寝不足です。
Kinō osoku made benkyō shite ite, nebusoku desu.


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