YOU SAID:

I am going to go to sleep earlier then normal today.

INTO JAPANESE

今日は普通より早く寝るつもりです。

BACK INTO ENGLISH

I'm going to bed earlier than usual today.

INTO JAPANESE

今日はいつもより早く寝ます。

BACK INTO ENGLISH

I go to bed earlier than usual today.

INTO JAPANESE

今日はいつもより早く寝る。

BACK INTO ENGLISH

I go to bed earlier than usual today.