Can't seem to think straight!!!!!

I've been sat at my computer all day and can't seem to do any tangible work. I have got to submit this piece of work tomorrow but nothing is flowing out of my head. I have taken short breaks, given myself rest to see if I can get new ideas but nothing. Don't know what to do!!!! I am going to do some more reading to see if it will jump start my brain. Hope you are having a more productive day?