Hi Louise, do not think you are the only one to fall asleep whilst driving it happens to a lot of people if the truth was known, I used to drive HGVs a night shift was the worst but it still happens at day time, The only thing I can say to you and all, If you feel you are dropping off at the wheel " STOP" for 30mins have a bit of a nod get yourself together and go again, In my experience It does not matter how hard it is to fight the sleep off It does not work, I have had the window down, shouting at myself, radio blasting, there is only one thing you can do as I have said, When you go to court just tell the truth, regards the sleep, as said, lessons will be leant in your case.