Does coffee actually help to wake someone up, or is it just a mind over matter type deal?

I heard once that coffee actually doesn't do anything to make someone more alert, and it was just one believing it did.

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SW-User

I used to love coffee. Now it just dehydrates me and gives me tummy ache and a headache. And that’s black decaf. I think the effect was all in my head. I just liked the bitter hot blackness.