hahaha... I am cultivating No Coffee on Rest Day , at least once a week I do not drink coffee.
My mood actually doesn't go with coffee mood. If I am on a good mood , coffee does not effect me.
However, the coffee benefits only exist if drank without sugar, otherwise it is as bad as Coke.
I am on the other hand have trouble with milk tea, so I usually cut down as much as I can unless I am on small espresso size.
To keep awake, try American Ginseng slices to substitude coffee, but you must have it without sugar and I can guarantee you, you will stay awake! Urgh! But you will stay awake, without the coffee side effects.