YOU SAID:

If I'm asleep and you are asleep then who's driving the car?

INTO JAPANESE

眠って、眠っている場合は、車を運転が誰ですか。

BACK INTO ENGLISH

When sleeping, sleeping, car driving?

INTO JAPANESE

寝ているとき寝て、車の運転ですか。

BACK INTO ENGLISH

While she is asleep in bed, is driving the car.

INTO JAPANESE

彼女がベッドで眠っている間は、車を運転します。

BACK INTO ENGLISH

Driving a car while she was sleeping in bed.

INTO JAPANESE

彼女がベッドで寝ている間に、車を運転します。

BACK INTO ENGLISH

Driving a car while she was sleeping in bed.