YOU SAID:

I am tired because I was awake until 5 am

INTO JAPANESE

午前5時まで起きていたので疲れました

BACK INTO ENGLISH

I was tired because I was up until 5 am

INTO JAPANESE

午前5時までだったので疲れました

BACK INTO ENGLISH

I was tired because it was until 5 am

INTO JAPANESE

午前5時までだったので疲れました

BACK INTO ENGLISH

I was tired because it was until 5 am