I need some advice mamas..

My 8 mo has never slept through the night but it seems like for weeks now hes waking up CONSTANTLY, like every hour or two, and sometimes he'll wake up at 3am thinking he's ready to get up for the day.. we are SOOO tired!!! I dont understand why or what im doing wrong. I just want to know how you went about getting your little one to sleep longer at night? I get that they go through sleep regressions too but this has been weeks of going through this with him