YOU SAID:

as that only would cause him to lose hours of sleep at night.

INTO JAPANESE

それは彼が夜に何時間も眠れないからです。

BACK INTO ENGLISH

That's because he can't sleep for hours at night.

INTO JAPANESE

それは彼が夜何時間も眠れないからです。

BACK INTO ENGLISH

Because he can't sleep for hours at night.

INTO JAPANESE

彼は夜何時間も眠れないからです。

BACK INTO ENGLISH

Because he can't sleep for hours at night.