YOU SAID:

I'm so quick, I've been known to be fast asleep

INTO JAPANESE

私はとても速いです、私は速く眠っていることが知られています

BACK INTO ENGLISH

I am very fast, I am known to sleep fast

INTO JAPANESE

私はとても速いです、私は速く眠ることが知られています

BACK INTO ENGLISH

I am very fast, I am known to sleep fast