YOU SAID:

I am so tired. If I fell asleep I would sleep for 12 hours.

INTO JAPANESE

私はとても疲れている。もし私が眠っていたら１ ２時間も眠っていただろう。

BACK INTO ENGLISH

I am very tired. If I had been asleep, I would have been asleep for twelve hours.

INTO JAPANESE

私はとても疲れている。もし私が眠っていたら、１ ２時間眠っていただろう。

BACK INTO ENGLISH

I am very tired. If I had been asleep, I would have been asleep for twelve hours.