Falling asleep in church

So for a little background I work at a fast food place all week (except Sunday) and usually I have to close so that means I am working anywhere between 7-10 hours a day and along with this I've been having trouble sleeping lately. Anyways this Sunday I fell asleep during my pastors sermon after trying hard to stay up for the last ten minutes. I was then woke up by him patting me on the leg while he was preaching. Is there anything I can do to help me stay awake during church?? Pls help!