YOU SAID:

I never sleep, cause sleep is the cousin of death

INTO JAPANESE

私は決して眠れない、睡眠は死のいとこである

BACK INTO ENGLISH

I can never sleep, sleep is the cousin of death

INTO JAPANESE

私は決して眠れません、睡眠は死のいとこです

BACK INTO ENGLISH

I can never sleep, sleep is the cousin of death