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Personal anecdata, I was drinking several cups of coffee to get myself through 7 hours' driving with a full work day spliced within. I used to feel absolutely dreadful. Why am I so tired despite drinking all this coffee? I used to think. I then started limiting myself to one small coffee a day. Bingo, all symptoms gone. The coffee was making me feel far worse than I would otherwise have done as it wore off, I believe.

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It's alertness effects go away after repeated use and subsequent tolerance building. The best way to use it is in moderation: decaf or no caffeine some days, caffeine other days when it is needed. Drinking it daily is common and often done out of liking/habit/addiction or some combination of those. However, the best positive effects will be seen with moderation.

"It's alertness effects go away after repeated use and subsequent tolerance building"

Link to evidence? I don't remember seeing anywhere in the literature that caffeine stops being effective when used daily and long-term, nor does it match my own experience.

Thanks!

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