YOU SAID:

Should we go to sleep or should we read?

INTO JAPANESE

眠らなければならないのでしょうか？

BACK INTO ENGLISH

Do I have to sleep?

INTO JAPANESE

私は眠らなければなりません。

BACK INTO ENGLISH

I have to go to sleep.

INTO JAPANESE

そろそろ寝なくちゃ。

BACK INTO ENGLISH

I have to go to sleep.