How to fix my sleeping patter?

My stupid messed up sleeping pattern is screwing with my ability to focus on grades. I go to sleep at 11:30 cause I literally force myself. I get up 10 min before 7 and I am almost asleep in math at the end of the day. I can't take myself to actually do my homework unless It's much more impo than the comp. And I usually do it the day before it's due. HELP! I was never like this..