YOU SAID:

I am very tired and should go to sleep

INTO JAPANESE

私はとても疲れているので、寝るべきだ

BACK INTO ENGLISH

I'm so tired I should go to bed

INTO JAPANESE

疲れたから寝たほうがいい

BACK INTO ENGLISH

I'm tired. You should go to bed.

INTO JAPANESE

疲れた寝た方がいい

BACK INTO ENGLISH

I'm tired. You should go to bed.