YOU SAID:

I am so tired that I could sleep on a rock.

INTO JAPANESE

私はとても疲れて、私は岩の上で寝ることができました。

BACK INTO ENGLISH

I was very tired and I was able to sleep on the rock.

INTO JAPANESE

私は非常に疲れていて、私は岩の上で寝ることができました。

BACK INTO ENGLISH

I was very tired and I was able to sleep on the rock.