waking up

I feel like such a failure. I have missed going to my volunteer work in the morning several times, because I couldn't wake up in time. I even went into work this week an hour late. I have a big problem with not waking up on time. It makes me feel like just quitting everything, all my obligations. But then I would be stuck in the bed all day, days on end. I want to keep my obligations, to keep me out of that depressed state. Is it my medication that makes me so difficult at waking up? Or is it just how I am naturally; Come to think of it even in elementary school I  was hard to wake up. I was often chasing after the bus. I don't know what to do.