Sometimes when I am driving I'll black out, or at least it seems that way, I'll be driving usually on the highway one moment and the next thing I know I am a mile plus from where I was with no memory of what happened in the intervening time. It's possible I just get lost in thought then forget what I was thinking about but I'm worried it's more serious then that. It has happened when other people were in the car and they have never communicated concern about me whenever it happens so I know it's not like I am truly blacking out (even if that has happened to me when not driving) but still