What's with my little brother?

He won't sleep, if I won't! Sometimes I tend to get pissed off! Sure, it's nice that we're close, but I have my life! My mom always tells me to sleep early, so my brother can! I've been working on projects and homeworks from school, and sometimes my mom would come in, reminding me to sleep, because Theodore (that's how I call him, when I'm pissed) wouldn't sleep, if I don't! Sometimes, he'd come into my room and say, "Tommy, aren't you sleepy yet? I can't sleep too." I was like, "Ted, you're already 11, for cryin' out loud! You can manage without me!" Did I do the right thing, though? I feel kinda rotten.... I mean what kind of brother would say that?