To think that coffee makes you tired?

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I have noticed that coffee makes me rather tired which contrasts to the belief it is supposed to keep you awake. Does anyone know why this is?

It's a diuretic so it makes you need more water. Too much coffee and not enough water will make you tired.

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Try and limit coffee to two or three cups a day (water intake should be six to eight glasses a day, at least)

I don’t drink much coffee anyway , usually 1/2 cups

I have up all caffeine (including decaf) about 16 months ago and feel less tired. I don't have the cravings and peaks and troughs now.

Yeah I makes me tired. I think there’s an initial high and then a crash.