narcolepsy
"I have severe chronic pain from back, neck and knee injuries. Now fibromyalgia, which is a living hell.  I began to have what I call sleep attacks where I would just fall asleep; reading, standing, talking on the phone (embarrassing). I fell asleep standing in the dinning room and hit my face on the table.  That was when I went on this medicine. Has helped tremendously. Have had a couple of attacks on it. But very few. I can drive without fear. What a blessing.  I am worried about side effects. I don't want to be dependent on this medicine. But I need it, so I follow instructions and pray."