YOU SAID:

and with that alone, it would cause him to lose hours of sleep at night.

INTO JAPANESE

そしてそれだけでは、彼は夜に何時間も眠れなくなるでしょう。

BACK INTO ENGLISH

And that alone will prevent him from sleeping for hours at night.

INTO JAPANESE

そしてそれだけで、彼が夜に何時間も眠ることができなくなります。

BACK INTO ENGLISH

And that alone will prevent him from sleeping for hours at night.