how to wake up refreshed when work schedule is all over the place.. cant sleep!!

Hi, im 19 and a waiter, and my sleeping patterns are horribly imbalanced, i dont get home till after 1 some nights and i have to work mornings other days, sometimes the next day, and Im obviously having tons of trouble with my sleep. I wake up early no matter what and am exhausted in the morning but can fall asleep, its like im tired but i cant fall asleep, anyway, if i cant change my work schedule so dont recommend that, but is there any medication or medecine that can help me feel more refreshed in the morning and not so down all the time. Also my efficiency in sports has gone down dramatically, i feel so weak all the time.. anyone have any advice on what i can do or take without changing my lifestyle tooo much?

I would say discuss this with your physician.