YOU SAID:

I had a nightmare like this once

INTO JAPANESE

一度このような悪夢を見た

BACK INTO ENGLISH

Once saw a nightmare

INTO JAPANESE

かつての悪夢を見た

BACK INTO ENGLISH

I saw the nightmare before

INTO JAPANESE

私は前に悪夢を見た

BACK INTO ENGLISH

I saw the nightmare ago

INTO JAPANESE

前の悪夢を見た

BACK INTO ENGLISH

I saw the nightmare before

INTO JAPANESE

私は前に悪夢を見た

BACK INTO ENGLISH

I saw the nightmare ago

INTO JAPANESE

前の悪夢を見た