YOU SAID:

you need to go and sleeped

INTO JAPANESE

あなたは行って寝る必要があります

BACK INTO ENGLISH

You have to go and sleep

INTO JAPANESE

あなたは寝に行かなければなりません

BACK INTO ENGLISH

You have to go to bed

INTO JAPANESE

寝なければならない

BACK INTO ENGLISH

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.