I fall asleep watching TV, in church or meetings listening to a speaker, and have fallen asleep for a few seconds while driving two times in 6 months. A friend told me this is an indication of coming blindness? I have been to Mayo Clinic (live near here) and have a pill (modafinil) that I am to try on a short drive. Doctor is adjusting my sleep or bed times, and that is helping, but this last sleep while driving was very scary, ran a red light and almost hit a car.