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寝ないと

I need to go to sleep., if you don’t sleep

→ 寝る
phrase Uncommon #10,061
I need to go to sleep. A casual way to express necessity, often shortened from 寝ないといけない or 寝ないとならない. It literally leaves the condition “if I don’t sleep…” unfinished.
JA: そろそろ寝ないと。
EN: I should get to sleep soon.

今日は早く寝ないと。

I need to go to bed early tonight.

寝ないと…

I’ve got to sleep...

— तुम्बाड (2018)

マジ、寝ないと。

I really need to get some sleep.

遅いから寝ないとほっといてくれ

It's late, so I need to sleep. Leave me alone.

— 道 (1954)

おばあちゃん寝ないと…

Grandma, you need to get some sleep…

— तुम्बाड (2018)

「寝ないとハスターが…」

If you don't go to sleep, Hastur will...

— तुम्बाड (2018)

そろそろ寝ないと。

I should get to bed soon.

寝ないと

I have to go to bed.

— तुम्बाड (2018)

寝ないと…何だっけ？

I need to sleep... What was it again?

— तुम्बाड (2018)

phrase Rare #27,261
if you don’t sleep This condition is followed by what will happen if you don’t sleep. The consequence can also be left unstated, implying that you need to sleep.
JA: 寝ないとハスターが来るよ！
EN: If you don’t go to sleep, Haster will come!

寝ないと夜明けに野原へ行く

If I don't sleep, I'll go to the meadow at dawn.

— ほんとうのピノッキオ (2019)

おばあさん寝ないとハスターが来るよ！

Grandma, if you don’t go to sleep, Hastur will come!

— तुम्बाड (2018)

その時はこう言うのよ…「寝ないとハスターが来るよ！」

That’s when you say… “If you don’t go to sleep, Hastur will come!”

— तुम्बाड (2018)

寝ないとハスターが来るよ

If you don't go to sleep, Hastur will come.

— तुम्बाड (2018)

お父さん寝なさい…寝ないとハスターが来るよ！

Daddy, go to sleep… If you don’t, Hastur will come!

— तुम्बाड (2018)