How to Say Good Night in Japanese, and When Oyasumi Is Wrong

In English, good night can mean goodbye in the evening. In Japanese, oyasumi means you are going to sleep, and using it at 7 pm as you leave the office sounds strange.

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A phone showing a good-night message beside a bedside lamp
What you need to know

How to Say Good Night in Japanese, and When Oyasumi Is Wrong

Oyasumi nasai comes from the verb yasumu, to rest, so it belongs to bedtime: family members going to sleep, friends ending a late chat, a text before you put the phone down. It is not an evening greeting, which is konbanwa, and it is usually not the way to leave work at night. This guide covers oyasumi in its polite and casual forms, what to say instead when leaving in the evening, texting good night, and the very polite versions you will hear at hotels and ryokan.

Oyasumi nasai is for going to sleep, not for saying goodbye in the evening

Leaving work at night calls for osaki ni shitsurei shimasu or otsukaresama deshita

Texting good night uses the same words, often with a line about the day

Hotels and ryokan use very polite forms such as oyasumi nasaimase

Oyasumi belongs to bedtime

Oyasumi nasai is built on yasumu, to rest, and it keeps that sense: have a good rest. It is said when someone is going to sleep, whether that is you, the other person or a whole household.

That is the key difference from English. Good night in English can simply mean goodbye after dark. In Japanese, saying oyasumi to someone who is heading to a bar, a train or more work sounds as if you think they are going to bed.

JapaneseRomajiMeaning
おやすみなさい。Oyasumi nasai.Good night: polite
おやすみ。Oyasumi.Night: casual
おやすみなさい、また明日。Oyasumi nasai, mata ashita.Good night, see you tomorrow
こんばんは。Konbanwa.Good evening: a greeting on meeting, not a goodbye

Leaving in the evening

When you leave work, class or a gathering in the evening, the parting phrases are the same as at any other time of day. At work, osaki ni shitsurei shimasu is what you say as you leave before others, and they reply otsukaresama deshita.

With friends, jā, mata or mata ashita does the job, and ki o tsukete kaette ne, get home safe, is a warm addition late at night.

JapaneseRomajiMeaning
お先に失礼します。Osaki ni shitsurei shimasu.Excuse me for leaving before you
お疲れさまでした。Otsukaresama deshita.Thanks for your work today: the reply
じゃあ、また明日。Jā, mata ashita.See you tomorrow
気をつけて帰ってね。Ki o tsukete kaette ne.Get home safe
今日はありがとうございました。Kyō wa arigatō gozaimashita.Thank you for today

At home and with family

At home, oyasumi is the last word of the day, and it is often preceded by a short announcement that you are going to bed. Parents with young children add warmer lines, and couples and close friends may add a gentle wish.

JapaneseRomajiMeaning
もう寝るね。Mō neru ne.I'm off to bed
先に寝るね、おやすみ。Saki ni neru ne, oyasumi.I'm going to bed first, night
ゆっくり休んでね。Yukkuri yasunde ne.Get a good rest
いい夢見てね。Ii yume mite ne.Sweet dreams
早く寝なさい。Hayaku nenasai.Go to bed now: parent to child

Texting good night

Messaging uses the same words with a little decoration. A wavy line or a sticker softens it, and a line about the day or the conversation makes it warmer than oyasumi alone.

With someone you are not close to, keep it simple and polite: a thank-you for the day and oyasumi nasai.

JapaneseRomajiMeaning
おやすみ〜Oyasumi~Night night: casual text
そろそろ寝るね。おやすみ！Sorosoro neru ne. Oyasumi!I'm going to sleep now. Night!
今日は楽しかった。おやすみ。Kyō wa tanoshikatta. Oyasumi.Today was fun. Good night
遅くまでありがとう。おやすみなさい。Osoku made arigatō. Oyasumi nasai.Thanks for chatting so late. Good night

Hotels, ryokan and service

Staff at hotels and ryokan use very polite versions, especially when you head to your room for the night or when bedding has been laid out. You do not need to produce these, but recognising them lets you reply naturally.

A simple oyasumi nasai back, or arigatō gozaimasu, is the right response.

JapaneseRomajiMeaning
おやすみなさいませ。Oyasumi nasaimase.Good night: very polite, from staff
ごゆっくりお休みください。Go-yukkuri o-yasumi kudasai.Please have a restful night
お布団を敷いておきました。O-futon o shiite okimashita.We've laid out your futon
ありがとうございます。おやすみなさい。Arigatō gozaimasu. Oyasumi nasai.Thank you. Good night

Choosing by situation

The table sums up which phrase fits which evening moment.

MomentWhat to sayNote
Family member going to bedGood night, casual or politeThe core use
Leaving the office at nightExcuse me for leaving firstNot good night
Ending a late phone call or chat with a friendGood night, often with see you tomorrowFine if they will sleep soon
Colleagues going to their rooms on a work tripGood night, politeNatural even with a superior
Arriving somewhere in the eveningGood eveningA greeting, not a parting

The mistakes learners make

All four come from treating good night as a general evening goodbye. Once oyasumi is tied to sleep in your head, the rest follows. Practising the end of a shift or a dinner with your AI Sensei in Unihongo's 3D classroom helps, and the corrections in the session report can point out an oyasumi that slipped into the wrong moment.

  • Saying oyasumi when leaving work at 7 pm.
  • Using oyasumi as a greeting when arriving in the evening.
  • Saying only oyasumi to a superior, which is too casual; use oyasumi nasai.
  • Forgetting that the reply to osaki ni shitsurei shimasu is otsukaresama deshita, not oyasumi.
Key points

A practical way to improve

Tonight, say or text oyasumi only at the moment someone is actually going to bed, and use jā, mata ashita or otsukaresama deshita for every other evening goodbye. Then ask your AI Sensei in Unihongo's immersive 3D classroom to play a colleague at the end of a late shift so you practise leaving without reaching for oyasumi.

  1. 1

    Choose one clear goal

    Focus each session on a situation or skill you can actually use.

  2. 2

    Practice actively

    Say complete answers aloud instead of only reading or recognizing Japanese.

  3. 3

    Review and repeat

    Keep useful corrections and revisit the same skill until it feels natural.

FAQ

Frequently asked questions

Can I say oyasumi nasai when leaving someone's house at night?

Usually not, unless they are about to sleep. When leaving at night people say ojama shimashita, thank the host, and add something like ki o tsukete or oyasumi nasai only if it is genuinely late and everyone is heading to bed.

Is oyasumi nasai polite enough for a boss?

Yes, oyasumi nasai is polite. It is the natural thing to say to a superior on a work trip when everyone goes back to their rooms. Oyasumi alone is casual.

What is the difference between konbanwa and oyasumi?

Konbanwa is a greeting, like good evening, used when you meet someone in the evening. Oyasumi is a parting phrase used when someone is going to sleep.

What do I text a friend at night?

Oyasumi alone is fine. Adding sorosoro neru ne, I'm heading to bed now, or a short thanks for the chat makes it warmer.

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