YOU SAID:
I want to go to sleep but I can't
INTO JAPANESE
私は眠りたいが、できない
BACK INTO ENGLISH
I want to sleep but i can't
INTO JAPANESE
そうしたいけど出来ないの
BACK INTO ENGLISH
I want to, but I can't
INTO JAPANESE
そうしたいけど出来ないの
BACK INTO ENGLISH
I want to, but I can't
That didn't even make that much sense in English.