<human>: Can you condense the text into three sentences or less?

Hey Ask Reddit, I'm a college student that lives with his family, and my teenage younger brother is severely depriving himself of sleep. He stays up until 4 am almost every night playing a free to play MMO, and even if studying isn't important to him, he's missing school constantly when his body gives out and he sleeps all day. He doesn't talk to any of his old friends and his good grades are now all Cs and Ds. Our mother (single parent) insists that he's actively choosing to ruin his grades and body, which has been counterproductive to the kind of advice I've tried giving him in the past. I've tried to help him learn how his actions can have consequences, but all of that advice has fallen flat. I know part of growing up is learning from your mistakes, but I don't want him to fall as hard as I have in the past (ex hardcore WoW raider, which ate into my grades for 2 years until I got a handle on everything and quit).
<bot>: My brother thinks an MMO is more important than his health, school, and his social life, and barely gets 3 hours of sleep every night. What do?