寝 不 足(ねぶそく)

ねぶそく

noun, na-adjective

lack of sleep; sleep deprivation

health daily-life

1. lack of sleep; sleep deprivation; not getting enough sleep

The state of having slept less than needed, often resulting in tiredness.

寝不足(ねぶそく)で頭(あたま)がぼーっとする。

My head is foggy from lack of sleep.

最近(さいきん)寝不足(ねぶそく)が続(つづ)いている。

I've been sleep-deprived lately.

寝不足(ねぶそく)は健康(けんこう)に良(よ)くない。

Lack of sleep is not good for your health.

Compound of 寝(ね) (sleep) + 不足(ふそく) (insufficiency). Describes the state of not having slept enough. Can function as a noun or na-adjective.

Common collocations

寝不足(ねぶそく)で〜: due to lack of sleep
寝不足(ねぶそく)が続(つづ)く: lack of sleep continues
寝不足(ねぶそく)を解消(かいしょう)する: to catch up on sleep
寝不足(ねぶそく)気味(ぎみ): a bit sleep-deprived

Similar words

睡眠不足(すいみんぶそく): sleep deprivation (more formal/medical)
寝不足(ねぶそく) is the everyday, conversational term

Related sleep vocabulary

夜更(よふ)かし: staying up late
二度寝(にどね): going back to sleep
寝坊(ねぼう): oversleeping

Related Words

Related: 徹夜(てつや) (staying up all night (a common cause))

Compare: 睡眠(すいみん)不足(ぶそく) (sleep deprivation)

Related: 夜更(よふ)かし (staying up late)

Related: 二度寝(にどね) (going back to sleep)

Related: 寝坊(ねぼう) (oversleeping)

Compare: 徹夜明(てつやあ)け (the morning after an all-nighter)

Compare: 遅寝(おそね) (going to bed late)

general

Added 2026.1.21 8:30 · Revised 2026.9.2 13:01

07500/07692_nebusoku