YOU SAID:

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

INTO JAPANESE

それだけで、彼は夜に何時間も眠れなくなるでしょう。

BACK INTO ENGLISH

That alone will prevent him from sleeping for hours at night.

INTO JAPANESE

それだけで、彼は夜に何時間も寝ることができなくなります。

BACK INTO ENGLISH

That alone will prevent him from sleeping for hours at night.