YOU SAID:
I want to sleep because I'm always tired and can never be fulfilled
INTO JAPANESE
いつも疲れていて満足できないので眠りたい
BACK INTO ENGLISH
I'm always tired and unsatisfied so I want to sleep
INTO JAPANESE
いつも疲れて物足りないので寝たい
BACK INTO ENGLISH
I'm always tired and unsatisfied so I want to sleep
That didn't even make that much sense in English.