Wait, if you are having a nightmare and you know it is a dream you can turn it into a positive LD experience. I suggest either whipping whatever is scaring you's ass or just flying away and exploring. If you really want to wake, just imagine you actual body laying in bed. Try to feel you actual body and once you do, force yourself awake by moving your actual body. If you get a FA, just go explore the dream world. If you FA from the nightmare then it is over anyway. A nightmare isn't permanent. You can always turn the tides of a dream.