I have noticed that this sensitivity can happen with age. When I was in my 20's I could drink 10-15 cups of coffee a day well into the night. Now I suffer from

I have noticed that this sensitivity can happen with age. When I was in my 20's I could drink 10-15 cups of coffee a day well into the night. Now I suffer from the same sensitivity in my 40's that you speak of. But I think the reason some folks can drink so much coffee and still sleep is that at some point caffeine becomes a sedative. At least that is what I have been told.