YOU SAID:

i had so much caffeine today that i cant sleep

INTO JAPANESE

今日はカフェインがたくさんあったので寝られない

BACK INTO ENGLISH

I could not sleep because there was a lot of caffeine today

INTO JAPANESE

今日はたくさんのカフェインがあったので眠れませんでした

BACK INTO ENGLISH

I could not sleep because there was a lot of caffeine today