My brother's blaring Fajr alarms wreck my sleep and health-help!

Assalamu alaikum everyone, I'm beyond exhausted and really need some advice. I share a room with my younger brother, and while I admire his intention to wake up for Fajr, his approach is making my life miserable. He sets like 10 super loud alarms early in the morning, but he sleeps like a rock and never hears any of them. They just blare on and on unless I physically go over and shake him-which barely works, he just mumbles and goes back to sleep. So basically, I get jolted awake, lose my precious rest, and he still misses salah. I’m still growing, and I truly need my sleep. I’m dragging through the days with a huge sleep debt, and honestly, the daily frustration is chipping away at my own spiritual peace-it’s hard not to feel resentful every morning, even though I pray myself. The bigger problem is that no one else in my family prays regularly, so they don’t feel what I’m going through, and my parents aren't aware of how badly this is hurting my health because it’s not happening in their room. I’ve tried talking calmly, I’ve tried getting upset, but nothing sticks-every night it’s the same story. Has anyone faced this? Any ideas for different alarm types, like vibrate-only wristbands, or clever ways to convince him to change these habits without hurting his motivation for Fajr? Jazakum Allahu khairan for any help.