Advise

Hi everyone! I need some advise on how to help my 1 year old(20 months) sleep through the night? For about a month now he has been waking up at the same time every night. At first i thought it was a sleep regression, but I'm starting to think it's out of habit. He sleeps in his own room and knows how to open his door, so he usually just ends up in our bed. He still is breastfeeding, so it's the only way he can go back to sleep quicker. I know he doesn't need to do it anymore, but I just don't like hearing him scream and cry. Is it best to just go cold turkey? I'm in dire need of sleep, any advice pls??