YOU SAID:

She wasn't here last night when we went to sleep.

INTO JAPANESE

私たちが眠りについたとき彼女は昨夜ここにいなかった。

BACK INTO ENGLISH

She did not stay here last night when we got to sleep.

INTO JAPANESE

私たちが寝ると彼女は昨夜ここにいなかった。

BACK INTO ENGLISH

She did not stay here last night when we slept.

INTO JAPANESE

私たちが寝たとき、彼女は昨夜ここにいなかった。

BACK INTO ENGLISH

When we went to bed, she was not here last night.

INTO JAPANESE

私たちが寝たとき、彼女は昨夜ここにいなかった。

BACK INTO ENGLISH

When we went to bed, she was not here last night.