YOU SAID:

without sleep there is nothing but tired

INTO JAPANESE

眠らないと疲れしかない

BACK INTO ENGLISH

I only feel tired if I don't sleep

INTO JAPANESE

眠らないと疲れない

BACK INTO ENGLISH

I am not tired if I do not sleep

INTO JAPANESE

眠らなくても飽きません

BACK INTO ENGLISH

I do not get tired even if I do not sleep

INTO JAPANESE

寝ていなくても飽きません

BACK INTO ENGLISH

I do not get tired even if I do not sleep