How to stay awake longer?

I am in 8th grade, and I have such bad sleeping habits and am constantly tired! My typical schedule is waking up at 6am and get ready for school, leave for morning rehearsal, go to school, go to rehearsal, go to crew, go to voice lesson, go to obedience class (for my dog), get home at 9:30 and do homework and go to bed at 12-1am. I always feel extremely tired during the day, and I never finish my homework at night which as made my grades seriously bad (I have almost ALL 'C')! Are there any ways to help me stay up later? It's already 11:45 and I'm only halfway done with my homework, and I can feel myself dosing off, so what can I do to help me wake up and finish my homework? It's almost the end of school, and I want my grades to be at least 'B's, not 'C's. Please help! I need to finish my homework tonight and I'm half asleep!