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寝なくちゃ

have to sleep

→ 寝る
寝 sleep, go to bed + なく Negative (adverbial form) + ちゃ Contraction of ては
verb · necessitative Rare #37,028
have to sleep Informal contraction of 寝なくては（ならない）.
JA: もう遅いから、寝なくちゃ。
EN: It's already late, so I have to sleep.
Conjugation of 寝る
Necessitative
寝なきゃ寝なくちゃ

もう寝なくちゃ。

I have to go to bed now.

そろそろ寝なくちゃ。

I should go to bed soon.

もうそろそろ寝なくちゃ。

I should probably go to bed soon.

寝なくちゃ。

I have to go to sleep.