I'm 58 Male. My Body Is Slim And Toned From

I'm 58 male. My body is slim and toned from exercise all of my life. My habits are fairly healthy. Since I was a teen I can not stay awake during the day. I pass out in meetings always. I space off at my desk. Mostly my faults are overlooked because I am very good and smart at what I do with computer programming etc. I've suffered depression when a teen and general anxiety in mid-life but for the most part I am happy and healthy. Recently I just got over a 30 some year HCV problem by the new medications. Anyway, I can not stay awake unless I am busy at work. It is not once in a while. It is always. I can fall asleep just by closing my eyes or reading or listening. What can my problem really be? This is really chronic.