over worked!!!!!!!!!

i am extremely tired......i think people don't know how hard it is to be a student athlete....im up at 6 mon. thru fri. (off on wed.)...im taking 18hrs.... on mon. & wed. i have 4 classes and 1 of them on both days is 3hrs....im getting as much sleep as possible...but im fighting the sleep in class....i want a cup of coffee or an energy drink...but drinking to much can make drug test positive....i feel like im starting to fall behind....