YOU SAID:

I need to go to bed half an hour ago.

INTO JAPANESE

私はベッドに入る 30 分前に必要があります。

BACK INTO ENGLISH

Must be 30 minutes before I go to bed.

INTO JAPANESE

私は寝る前に 30 分をする必要があります。

BACK INTO ENGLISH

You need 30 minutes before I go to bed.

INTO JAPANESE

私は寝る前に 30 分が必要です。

BACK INTO ENGLISH

Before I go to bed 30 minutes is required.

INTO JAPANESE

私は寝る前に 30 分は必要です。

BACK INTO ENGLISH

Before I go to bed 30 minutes is required.