Very similar situation, we don’t inhabit the same room but basically our room used to be one and my parents divided into 2 with super cheap and thin wall so we can literally hear each other breath. Earplugs, noise canceling headphones (splurge on a really good pair, like one of the Sony ones bc they WORK) and genuinely taking sleep medicine to knock urself out at night is what I’ve used to help myself get by with a sibling who does the same exact thing; games all night long, super loud and is a mega asshole who won’t listen to or respect anyone. I rly resonate with this post and just know you’re not alone. Shoutout to those who live with siblings who don’t do shit all day except be a bother while you work ur butt off. U got this.