The main point here has already been established: don't ever ever ever touch the students - PARTICULARLY not to wakeup someone who is sleeping. There's a reason why they say to never wake a sleepwalker. Many people who are forcibly awoken will immediately drop into panic mode. It's an evolved survival trait. In the jungles way back when if something woke you up at night it was most likely trying to eat you - you come up fighting for survival. After the situation has escalated it's too late. Realistically, the student is there for an education. If they chose to not partake in the lecture, thats fine. He might be ok with failing, or he might even already know the material. Regardless - in this situation you let sleeping dogs lie. Continue your lesson plan and don't touch them (and for goodness sakes don't involve other students by asking THEM to wake someone else). At this point the boat may have sailed on this one though. Apologize, do the sorry dance, and hope for the best.