YOU SAID:

I find my cat very interesting sometimes when he sleeps

INTO JAPANESE

私は眠っているときに私の猫がとても面白いと感じる

BACK INTO ENGLISH

I feel my cat is very fun while sleeping

INTO JAPANESE

私は眠っている間、私の猫はとても楽しいと感じています

BACK INTO ENGLISH

While I was sleeping, my cat is so much fun and I believe

INTO JAPANESE

寝ていると、猫はとても楽しいと思います

BACK INTO ENGLISH

I think sleeping and the cats are so much fun

INTO JAPANESE

寝ていると、猫がとても楽しいと思う

BACK INTO ENGLISH

I think sleeping and cat fun

INTO JAPANESE

寝ていると猫の楽しいと思う

BACK INTO ENGLISH

I think sleeping and cat fun