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寝なくちゃ

have to sleep, must go to bed

→ 寝る
寝 to sleep + なく Negative + ちゃ Contraction of ては
verb · informal Rare #39,667
have to sleep, must go to bed Colloquial contraction of 寝なくては (ならない).
JA: もう寝なくちゃ。
EN: I have to go to bed now.
Conjugation of 寝る
Necessitative
寝なきゃ寝なくちゃ

寝なくちゃ。

I have to go to sleep.

そろそろ寝なくちゃ。

I should go to bed soon.

もう寝なくちゃ。

I have to go to bed now.

もうそろそろ寝なくちゃ。

I should probably go to bed soon.