My SO lets SK’s have TV’s on all night

Greetings all, first post here and I need some advice. I have 3 step kids, 7M, 5F and 3M, and I’m having a few issues. A big one being that in each of their rooms, there is a TV. My SO says that they can’t fall asleep without a tv, but the problems come from them having a TV and having it on at night. All the children refuse to close their doors at night, and my SO refuses to close ours.

The children, throughout the night, turn up their TV’s slowly (no matter how many times they’re asked or told to turn them down), my SD refuses to sleep by herself, which creates constant arguing over what shows to watch, who has the remote, my SS(3) throws tantrums when he doesn’t get to watch the exact show he wants, which changes every so often because he doesn’t know how to pick his show. These problems last till around 10:30-11:00 regardless of weekends or school nights, and ruin any chance of intimacy I can have with my SO, as the children will either be screaming/playing till they eventually fall asleep, or storming in our bedroom to talk to us about changing their show, or how another won’t let them watch the show they want, or how the remote doesn’t work anymore. And by the time it’s over, my SO is too tired to be intimate.

Really I just need advice on how to deal with the situation, I personally feel as if children shouldn’t have TV’s in their rooms, as it can mess with their melatonin production, and creates nighttime wars over remotes, if I mention the situation to my partner, she usually reflects with “yes remind me how horrible of a job I’ve been doing” or something similar. Just need some friendly advice please.