What is a good alarm clock?

Every morning, I'm constantly late to school because of my sleeping habits. I have a loud alarm clock that I wake up to, but everyday I just turn it off. But, I really can't help it. Then when I wake up again its very late. I always vaguely remember waking up, but then I guess I must just turn of the alarm and fall back to sleep. The problem is not the loudness, because I know I must have some sort of consciousness to be able to press the numerous ons set, but more of a problem of me staying up after that. Anyone have an alarm clock idea that would help?