YOU SAID:

There's nothing wrong with sleeping for 6 hours a night.

INTO JAPANESE

一晩6時間眠っても問題はありません。

BACK INTO ENGLISH

There is no problem sleeping for six hours a night.

INTO JAPANESE

一晩6時間寝ても問題ありません。

BACK INTO ENGLISH

Night 6 hours no problem.

INTO JAPANESE

夜6時間は問題ありません。

BACK INTO ENGLISH

There is no problem for 6 hours at night.

INTO JAPANESE

夜間6時間は問題ありません。

BACK INTO ENGLISH

There are no problems for 6 hours at night.

INTO JAPANESE

夜間6時間は問題ありません。

BACK INTO ENGLISH

There are no problems for 6 hours at night.