Neru vs Nemuru: What Is the Difference Between Japanese Sleep Verbs?

Hello, I’m Kodak.

Japanese has two very common verbs that are both translated as “to sleep”:

The difference is not absolute. When you simply mean that someone sleeps, both verbs may be natural.

However, 寝る has a broader connection with lying down, going to bed, and the daily act of sleeping, while 眠る focuses more directly on the loss of conscious activity and the state of sleep itself.

Neru vs Nemuru: The Basic Difference

Compare these two sentences:

毎晩11時に寝ます。
Maiban jūichi-ji ni nemasu.
I go to bed at 11 every night.

赤ちゃんが静かに眠っています。
Akachan ga shizuka ni nemutte imasu.
The baby is sleeping peacefully.

In the first sentence, 寝る describes a daily bedtime action.

In the second, 眠る directs attention to the baby’s sleeping state.

What Does Neru (寝る) Mean?

寝ねる is the most useful everyday verb for talking about going to bed and sleeping.

1. Neru Means “To Go to Bed”

今日は早く寝ます。
Kyō wa hayaku nemasu.
I will go to bed early today.

昨日は何時に寝た？
Kinō wa nanji ni neta?
What time did you go to bed yesterday?

In these sentences, English uses go to bed. The person may not fall asleep immediately, but the bedtime activity begins.

2. Neru Means “To Lie Down”

ベッドに寝てください。
Beddo ni nete kudasai.
Please lie down on the bed.

疲れたので、少し横になって寝た。
Tsukareta node, sukoshi yoko ni natte neta.
I was tired, so I lay down for a while.

Because 寝る can focus on body position, a person may be 寝ている without being fully asleep in some contexts.

3. Neru Means “To Sleep”

毎日7時間寝ています。
Mainichi nana-jikan nete imasu.
I sleep seven hours every day.

昨日はよく寝た。
Kinō wa yoku neta.
I slept well last night.

For an everyday question about sleep time, 寝る is extremely common.

何時間寝た？
Nan-jikan neta?
How many hours did you sleep?

4. Neru Means “To Stay in Bed Because of Illness”

風邪で一日中寝ていた。
Kaze de ichinichijū nete ita.
I stayed in bed all day with a cold.

The person may sleep part of the time, but the sentence can also mean that they remained in bed to rest.

What Does Nemuru (眠る) Mean?

眠ねむる focuses on the state in which conscious activity stops and a person or animal is asleep.

1. Nemuru Focuses on Being Asleep

彼はソファでぐっすり眠っている。
Kare wa sofa de gussuri nemutte iru.
He is sleeping soundly on the sofa.

子どもが安心して眠れる環境が必要だ。
Kodomo ga anshin shite nemureru kankyō ga hitsuyō da.
Children need an environment where they can sleep peacefully.

The physical position is not central. Someone can 眠る on a bed, in a chair, or on a train.

2. Nemuru Is Common in Literary or Gentle Descriptions

月明かりの下で、町は静かに眠っていた。
Tsukiakari no shita de, machi wa shizuka ni nemutte ita.
The town slept quietly under the moonlight.

どうか安らかに眠ってください。
Dōka yasuraka ni nemutte kudasai.
Please rest in peace.

眠る often sounds natural when the speaker emphasizes peacefulness, depth, stillness, or a poetic image.

3. Nemuru Can Mean “To Rest in a Grave”

多くの兵士がこの地に眠っている。
Ōku no heishi ga kono chi ni nemutte iru.
Many soldiers rest in this land.

This is a respectful or literary way to say that deceased people are buried there.

4. Nemuru Can Describe Dormant Things

海底には多くの資源が眠っている。
Kaitei ni wa ōku no shigen ga nemutte iru.
Many resources lie hidden beneath the seabed.

倉庫に貴重な資料が眠っていた。
Sōko ni kichō na shiryō ga nemutte ita.
Valuable documents had been lying undiscovered in the warehouse.

Here, nothing is literally asleep. The image is that something remains inactive, hidden, or unused.

When Neru and Nemuru Are Both Natural

When describing ordinary sleep, the two verbs often overlap.

Both are correct. The first is a very ordinary conversational statement. The second places slightly more attention on the quality or state of sleep.

Example: “The Baby Is Sleeping”

Example: “I Slept for Eight Hours”

When Only Neru Is the Natural Choice

1. Going to Bed

もう寝ます。
Mō nemasu.
I’m going to bed now.

もう眠ります is grammatically possible, but it sounds more like “I will now enter sleep” and is not the normal everyday announcement before going to bed.

2. Lying Down Without Sleeping

眠くないけど、ベッドに寝ている。
Nemukunai kedo, beddo ni nete iru.
I’m not sleepy, but I’m lying on the bed.

眠る would be contradictory here because the person says they are not sleepy and is only lying down.

3. Being Confined to Bed

病気で三日間寝ていた。
Byōki de mikka-kan nete ita.
I was in bed sick for three days.

This does not mean the person slept continuously for three days.

4. Sleeping With Someone

Depending on context, 人と寝る can mean to share a bed or to have sex with someone.

When Nemuru Is Especially Natural

1. Emphasizing Deep or Peaceful Sleep

彼女は薬を飲んで深く眠った。
Kanojo wa kusuri o nonde fukaku nemutta.
She took the medicine and fell into a deep sleep.

2. Sleeping While Not Lying Down

彼は椅子に座ったまま眠っていた。
Kare wa isu ni suwatta mama nemutte ita.
He was asleep while still sitting in the chair.

3. Death, Graves, and Memorial Language

祖父は故郷の墓地に眠っている。
Sofu wa furusato no bochi ni nemutte iru.
My grandfather rests in a cemetery in his hometown.

4. Hidden or Dormant Potential

彼の中には大きな才能が眠っている。
Kare no naka ni wa ōkina sainō ga nemutte iru.
Great talent lies dormant within him.

Nerarenai vs Nemurenai: “I Can’t Sleep”

Two common expressions are:

Nemurenai Focuses on Inability to Fall Asleep

心配で眠れない。
Shinpai de nemurenai.
I cannot sleep because I am worried.

The person may already be in bed, but sleep will not come.

Nerarenai Can Have a Broader Meaning

仕事が多くて、今夜は早く寝られない。
Shigoto ga ōkute, kon’ya wa hayaku nerarenai.
I have too much work, so I cannot go to bed early tonight.

床がぬれていて、ここでは寝られない。
Yuka ga nurete ite, koko de wa nerarenai.
The floor is wet, so I cannot lie down or sleep here.

What About 寝れない?

寝れない (nerenai) is widely heard in casual Japanese as a shortened potential form of 寝る.

The traditionally regular potential form is 寝られない. In careful or formal writing, use 寝られない. In conversation, you will often hear both.

Nekaseru vs Nemuraseru: “Put Someone to Sleep”

寝かせる (Nekaseru)

寝かせる means to put or let someone lie down, put someone to bed, or let someone sleep.

子どもを8時に寝かせた。
Kodomo o hachi-ji ni nekaseta.
I put the child to bed at eight.

病人をベッドに寝かせた。
Byōnin o beddo ni nekaseta.
I laid the sick person on the bed.

眠らせる (Nemuraseru)

眠らせる means to make or allow someone to enter sleep. It focuses on causing the sleeping state.

母親は歌を歌って赤ちゃんを眠らせた。
Hahaoya wa uta o utatte akachan o nemuraseta.
The mother sang a song and put the baby to sleep.

医師は薬で患者を眠らせた。
Ishi wa kusuri de kanja o nemuraseta.
The doctor used medicine to put the patient to sleep.

Neru and Nemuru Conjugation

Neru Is an Ichidan Verb

Nemuru Is a Godan Verb

Nete Iru vs Nemutte Iru

彼はベッドで寝ている。
Kare wa beddo de nete iru.
He is sleeping or lying on the bed.

彼はベッドで眠っている。
Kare wa beddo de nemutte iru.
He is asleep on the bed.

Oyasumi, Neru, and Nemuru

おやすみ (oyasumi) is the familiar expression used before sleep.

Because 寝る describes going to bed, it naturally appears before おやすみ. 眠る is more likely when wishing or describing a particular quality of sleep.

Neru, Nemuru, and Related Sleep Words

Figurative Uses of Neru and Nemuru

Resources and Talent “Sleep”: 眠る

この地域にはまだ多くの資源が眠っている。
Kono chiiki ni wa mada ōku no shigen ga nemutte iru.
Many resources still lie hidden in this region.

君には未知の才能が眠っている。
Kimi ni wa michi no sainō ga nemutte iru.
Unknown talent lies dormant within you.

The image is of something present but inactive, hidden, or not yet awakened.

Money and Goods “Lie Idle”: 寝る

そのままでは資金が寝てしまう。
Sono mama de wa shikin ga nete shimau.
If things stay that way, the funds will sit idle.

In this business-like use, 寝る describes money, stock, or goods remaining inactive and not being put to use.

Hair Lies Flat: 寝る

ワックスをつけると髪が寝てしまう。
Wakkusu o tsukeru to kami ga nete shimau.
When I apply wax, my hair lies flat.

This use comes from the physical image of something standing upright becoming flat.

Natural Example Sentences: Neru vs Nemuru

疲れたから、もう寝る。
Tsukareta kara, mō neru.
I’m tired, so I’m going to bed now.

昨夜は8時間寝た。
Sakuya wa hachi-jikan neta.
I slept for eight hours last night.

ベッドに寝ても、すぐには眠れなかった。
Beddo ni nete mo, sugu ni wa nemurenakatta.
Even after lying down in bed, I could not fall asleep immediately.

猫が窓のそばで眠っている。
Neko ga mado no soba de nemutte iru.
The cat is sleeping beside the window.

今日は忙しくて昼寝する時間がなかった。
Kyō wa isogashikute hirune suru jikan ga nakatta.
I was busy today and had no time to take a nap.

電車で座ったまま眠ってしまった。
Densha de suwatta mama nemutte shimatta.
I fell asleep while sitting on the train.

風邪をひいて、一日中寝ていた。
Kaze o hiite, ichinichijū nete ita.
I caught a cold and stayed in bed all day.

雨の音を聞くと、よく眠れる。
Ame no oto o kiku to, yoku nemureru.
I can sleep well when I listen to the sound of rain.

子どもを寝かせたあと、映画を見た。
Kodomo o nekaseta ato, eiga o mita.
I watched a movie after putting the child to bed.

古い箱の中に大切な手紙が眠っていた。
Furui hako no naka ni taisetsu na tegami ga nemutte ita.
Important letters had lain hidden inside an old box.

Mini Conversations Using Neru and Nemuru

Conversation 1: Going to Bed

Conversation 2: Unable to Fall Asleep

Conversation 3: Is the Baby Asleep?

Conversation 4: Lying Down but Awake

Common Beginner Mistakes

Mistake 1: Using Nemuru for “Go to Bed” Every Time

Mistake 2: Assuming Nete Iru Always Means Asleep

寝ている may mean sleeping, lying down, or being in bed. Use 眠っている when you specifically need to say that the person is asleep.

Mistake 3: Conjugating Nemuru Like an Ichidan Verb

Mistake 4: Confusing Nemui and Nemuru

眠いけど、まだ眠れない。
Nemui kedo, mada nemurenai.
I’m sleepy, but I still cannot fall asleep.

Mistake 5: Ignoring the Possible Meaning of 人と寝る

Depending on context, someone と寝る may imply a sexual relationship. Add a place or other context when you simply mean sharing a sleeping space.

Which Verb Should a Beginner Choose?

FAQ About Neru and Nemuru

What is the difference between neru and nemuru?

Neru (寝る) has a broad meaning that includes lying down, going to bed, and sleeping. Nemuru (眠る) focuses on entering or remaining in the state of sleep.

Which Japanese verb should I use for “go to bed”?

Use 寝る. For example, 11時に寝ます means “I go to bed at 11.”

Can both neru and nemuru mean “to sleep”?

Yes. Both can describe ordinary sleep. 寝る is especially common in everyday conversation and sleep routines, while 眠る often focuses more directly on the sleeping state.

What is the difference between nete iru and nemutte iru?

寝ている can mean sleeping, lying down, or being in bed. 眠っている more clearly means that someone is asleep.

What is the difference between nerarenai and nemurenai?

寝られない can mean that someone cannot sleep, go to bed, or lie down. 眠れない specifically emphasizes being unable to fall asleep.

Is neru an ichidan verb?

Yes. Its forms include 寝ない, 寝た, 寝て, and 寝られる.

Is nemuru an ichidan verb?

No. 眠る is a godan verb. Its forms include 眠らない, 眠った, 眠って, and 眠れる.

What is the difference between nekaseru and nemuraseru?

寝かせる means to put someone to bed, lay someone down, or let someone sleep. 眠らせる focuses on causing someone to become asleep.

Can neru mean “sleep with someone”?

Yes. Depending on context, 人と寝る may mean sharing a bed or having sex with someone. Additional context usually makes the intended meaning clear.

How do I say “I slept well” in Japanese?

Both よく寝た and よく眠った are possible. よく寝た is especially common in everyday conversation.

Summary: Neru vs Nemuru

Related Articles

• Japanese Words for Sleep: How to Say Sleep in Japanese
• What Does Inemuri Mean? Japan’s “Sleeping at Work” Culture Explained
• What Does Hirune Mean? How to Say “Nap” in Japanese
• What Does Gussuri Mean in Japanese?

References

• National Institute for Japanese Language and Linguistics: 寝る — basic meanings and sentence patterns for 寝る.
• National Institute for Japanese Language and Linguistics: 眠る — sleep, resting in a grave, and dormant-resource meanings.
• Kotobank: 寝る — dictionary meanings and historical usage.
• Kotobank: 眠る — dictionary meanings and usage comparison with 寝る.
• Goo Dictionary: 眠る — usage notes comparing 眠る and 寝る.