YOU SAID:
i went to bed last night
INTO JAPANESE
私は昨夜寝た
BACK INTO ENGLISH
I went to sleep last night.
INTO JAPANESE
私は昨夜寝た。
BACK INTO ENGLISH
I went to bed last night.
INTO JAPANESE
私は昨夜寝た。
BACK INTO ENGLISH
I went to bed last night.
That didn't even make that much sense in English.