YOU SAID:
よく眠ることが大事だと思います。
INTO JAPANESE
よく眠ることが大事だと思います。
BACK INTO ENGLISH
I think it is important to sleep well.
INTO JAPANESE
ぐっすり眠ることが大事だと思います。
BACK INTO ENGLISH
I think it is important to sleep well.
That didn't even make that much sense in English.