全然寝る
zenzen neru
not at all sleep
Literally: 全然 (Zenzen - Not at all / Completely) + 寝る (Neru - To sleep)
In 15 Seconds
- Used to describe staying awake all night or extreme exhaustion.
- Requires a negative verb form like 'nenai' to mean 'not at all'.
- Commonly used among friends, students, and coworkers in casual settings.
Meaning
This phrase is used to express that you haven't slept a single wink or are getting absolutely zero rest. It is the go-to expression for students, workers, and new parents who are running on empty.
Key Examples
3 of 6Texting a friend after a long night of studying.
昨日、試験勉強で全然寝てないんだよね。
I didn't sleep at all yesterday because of exam prep.
Talking to a coworker during a morning break.
昨日、近所がうるさくて全然寝られませんでした。
The neighborhood was loud, so I couldn't sleep at all yesterday.
Explaining to a teacher why you look tired.
すみません、昨夜は全然寝ておりません。
I apologize, I have not slept at all since last night.
Cultural Background
The 'Busy-ness' Badge: In Japanese work culture, saying you haven't slept is often a way to signal that you are a hard worker. It's a form of 'social currency.' Inemuri: Because people often 'zenzen netenai' at home, it is socially acceptable to nap on trains or even in meetings, as long as you remain upright. Exam Hell: Students during 'Juken' (exam) season are the most frequent users of this phrase, often sleeping only 4 hours a night.
The 'n desu' trick
Add 'n desu' ({全然|ぜんぜん}{寝|ね}てないんです) to make it sound like a soft explanation rather than a blunt statement.
Don't over-complain
While common, saying this every day might make you seem like you can't manage your time.
In 15 Seconds
- Used to describe staying awake all night or extreme exhaustion.
- Requires a negative verb form like 'nenai' to mean 'not at all'.
- Commonly used among friends, students, and coworkers in casual settings.
What It Means
This phrase is all about total sleep deprivation. When you say you are 全然寝ていない (the negative form), you mean your eyes never closed. It is much stronger than just saying you are tired. It implies a 0% success rate in your attempt to rest. In modern slang, 全然 can sometimes mean 'totally.' However, when paired with the idea of 'not at all,' it is a cry for help. It is the linguistic equivalent of a double-shot espresso. You are telling the world that your bed was a stranger last night.
How To Use It
To match the meaning of 'not at all,' you must use the negative form. You will usually say 全然寝ていない (I haven't been sleeping) or 全然寝なかった (I didn't sleep). Just saying 全然寝る sounds like slang for 'I'm totally going to sleep.' To complain about your rough night, stick to the negative endings. You can drop the い in 寝ていない to sound more natural. 全然寝てない is how you would actually say it to a friend. It is punchy and direct. No need for fancy particles here.
When To Use It
Use this when you are visibly exhausted. It is perfect for that 8:00 AM meeting after a gaming marathon. Use it when your friends ask why you look like a zombie. It is great for bonding over shared misery during finals week. If you are texting a friend about a loud neighbor, this is your phrase. It works well at a restaurant when you are too tired to order. Basically, if your caffeine levels are higher than your sleep hours, use this.
When NOT To Use It
Avoid using the casual form with your big boss. If you are in a formal job interview, don't say 全然寝てない. It sounds a bit too 'college student' for professional settings. Also, don't use it if you actually slept for four hours. Japanese people value accuracy in their suffering! If you slept a little, use あまり寝ていない instead. Using 全然 when you actually slept might make you seem dramatic. Also, avoid it in written academic reports.
Cultural Background
Japan has a complex relationship with sleep. There is a concept called Inemuri, which is napping in public. It is often seen as a sign that you worked yourself to exhaustion. Being 'the person who doesn't sleep' can sometimes be a badge of honor. It shows dedication to your studies or your company. However, the younger generation uses 全然寝てない more as a lifestyle complaint. It is a common 'humble brag' on social media. You will see it often on Twitter (X) accompanied by photos of energy drinks.
Common Variations
If you want to sound more intense, try 一睡もしていない. That means 'I haven't slept a single wink.' For a more 'slangy' vibe, you can just say 寝てなすぎてヤバい. This means 'It is crazy how much I haven't slept.' If you want to be slightly more polite, use 全然寝られませんでした. This shifts the focus to your inability to sleep, rather than just the fact that you didn't. You can also add まじで (seriously) at the beginning for extra emphasis. まじで全然寝てない is the ultimate exhausted student's mantra.
Usage Notes
Remember that `全然` is an intensifier. While it's very common in daily life, using it too much can make you sound a bit like a teenager. Always pair it with the negative form of the verb if you want to express a lack of something.
The 'n desu' trick
Add 'n desu' ({全然|ぜんぜん}{寝|ね}てないんです) to make it sound like a soft explanation rather than a blunt statement.
Don't over-complain
While common, saying this every day might make you seem like you can't manage your time.
Examples
6昨日、試験勉強で全然寝てないんだよね。
I didn't sleep at all yesterday because of exam prep.
The speaker uses the casual 'nai' form to show closeness.
昨日、近所がうるさくて全然寝られませんでした。
The neighborhood was loud, so I couldn't sleep at all yesterday.
Uses the polite 'deshita' form for a workplace setting.
すみません、昨夜は全然寝ておりません。
I apologize, I have not slept at all since last night.
Uses a more humble negative form 'orimasen'.
ゲームが楽しすぎて全然寝る気がない。
The game is too fun, I have no intention of sleeping at all.
Uses 'zenzen' to emphasize a lack of desire to sleep.
赤ちゃんが泣き止まなくて、全然寝させてくれないの。
The baby won't stop crying and won't let me sleep at all.
Uses the causative form to show the baby is 'making' them stay awake.
顔色悪いよ？全然寝てないでしょ。
You look pale. You haven't slept at all, have you?
The 'desho' at the end adds a tone of concern/assumption.
Test Yourself
Fill in the blank to say 'I haven't slept at all since yesterday.'
{昨日|きのう}から（ ）{寝|ね}てない。
'Zenzen' is the correct adverb to use with a negative verb to mean 'not at all.'
Which sentence is the most natural way to tell a friend you are tired because of zero sleep?
Choose the best option:
The '~te nai' form describes the current state, and 'n da' adds an explanatory tone.
Complete the dialogue.
A: {顔色|かおいろ}が{悪|わる}いですよ。 B: ええ、（ ）。
This explains why the person looks pale (kaoiro ga warui).
🎉 Score: /3
Visual Learning Aids
Levels of Sleep Deprivation
Casual
- • {全然|ぜんぜん}{寝|ね}てない
- • {寝不足|ねぶそく}
Extreme
- • {完徹|かんてつ}
- • {一睡|いっすい}もしてない
Practice Bank
3 exercises{昨日|きのう}から（ ）{寝|ね}てない。
'Zenzen' is the correct adverb to use with a negative verb to mean 'not at all.'
Choose the best option:
The '~te nai' form describes the current state, and 'n da' adds an explanatory tone.
A: {顔色|かおいろ}が{悪|わる}いですよ。 B: ええ、（ ）。
This explains why the person looks pale (kaoiro ga warui).
🎉 Score: /3
Frequently Asked Questions
2 questionsIn textbooks, yes. In real-life slang, it's often used positively (e.g., Zenzen daijobu).
It's better to use '{寝|ね}ていないんです' (polite) rather than '{寝|ね}てない' (casual).
Related Phrases
{徹夜|てつや}
similarAll-nighter
{一睡|いっすい}もしていない
synonymHaven't slept a wink
{寝不足|ねぶそく}
similarLack of sleep
{完徹|かんてつ}
specialized formComplete all-nighter
