YOU SAID:

I should go to sleep soon

INTO JAPANESE

私はすぐに寝なければならない

BACK INTO ENGLISH

I must go to bed at once.

INTO JAPANESE

私はすぐに寝る必要があります。

BACK INTO ENGLISH

I need to go to bed soon.

INTO JAPANESE

私はすぐに寝る必要があります。

BACK INTO ENGLISH

I need to go to bed soon.