Little Brother help!!?

Heres the story, i have alot of things to do, so i get gto bed around 12-1 so i try to wake up at 11:45. But my little brother sleeps throuout the whole morning and day, so he wakes up at like 5:00-7:00. He has been trying to wake me much early than i want, by smacking me with shoes.ramming into me like a football player, jumping on my back, then we get into a huge fight in the morning that wakes my mother and she is in a bad mood then all day. Any advice or reasons why he does this?he did this for 6days to a week...or so. I got upset and fought with him again this morning but my mom wants him to go to military school. Now-i actually dnt want him to go, cuz i remember we had alot of fun before, i need him to improve in 3weeks or he goes...=-( HELP