I too would notice a change in mood / general feeling with coffee.
Sometimes I'd have to be careful with it because too much is also not good - for anyone really. But it seemed just a cup of coffee or an espresso drink (I got an espresso machine as a present) will help alot. And not just for waking up either - as I said, it does seem to increase mood =P
I think it helps ease the symptoms of depression for some people.
I think getting addicted can make things worse, so you should be careful (as with any drug... yes... caffeine=drug)
so I'd do what feels best for you
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Yesterday I was so clever, so I want to change the world.
Today I am wise, so I am changing myself.
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