AITAH for getting pissed at my brother for breathing too loudly

I was at my aunts house with my siblings, and we were sleeping in the same room. My little brother kept messing around on his tablet, and it was making noise (plus we weren’t supposed to be on our electronics in the first place) so my sister had taken the tablet. So then he kept messing around and by that point I was getting pissed off. Hed gotten his tablet back, and started a timer for 7;00. (Side note it was the weekend and there was no reason he would need an alarm, plus it would wake us all up and I did not want to wake up at 7:00 in the morning) so I took the tablet and was trying to turn off the alarm when he attacked me physically for doing so. After that had all been dealt with he finally “went” to bed, and started breathing loudly (I know it was on purpose because he hadn’t been breathing that loudly before. And since I had misophromia and it was bothering me, I asked him to stop, and then my sister kept telling me to shut up, which was making things way worse, and led me to have a meltdown.