Birkin,
You'll probably skip this post but I am going to tell you this anyway for your own safety. If you are exhausted and sleepy, do not drive. When I worked at Celadon, they had me working 12 hour shifts 7 days a week for 2 months straight. the commute to work was 45 mins each way. Twice I fell asleep behind the wheel. It's a horrible feeling and a scary sight when you see a lifted Dodge Ram Pickup truck coming right at you. I know you have financial obligations but please listen to your body. I didn't. and it almost cost me my life. Twice. I'm not being condescending here, I am just trying to caution you so you dont make the mistakes I made.