Why do I feel sleepy after drinking coffee, but not tea?

Why do I feel sleepy after drinking coffee, but not tea?

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0 thoughts on “Why do I feel sleepy after drinking coffee, but not tea?”

  1. First, caffeine is a vaso-constictor thereby, it increases your heart rate and blood pressure. This is why caffeine is so effective for treating headaches.
    Second, caffeine is also a diuretic (it makes you pee).
    Therefore, if you are already dehydrated, then the caffeine will not have enough blood volume to shrink down the vessels to increase your blood pressure, and the caffeine will increase your dehydration to make you more tired.

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  2. One difference may be the theobromine as someone else noted. But, it is tea that has the Theobromine, not the coffee. See BioProfile Testing Laboratories, LLC . I also find that tea and coffee affet me quite differently; I find coffee and chocolate both associated with triggering migrains, while tea gives a lot of symptomatic relief from migraines.

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  3. Coffee contains two alkaloids – caffeine and theobromine. Caffeine narrows blood vessels increases blood pressure and makes you feel more alert. Theobromine acts as a vasodilator, it dilates blood vessels, causing a reduced blood pressure and make you feel sleepy . It kicks in after caffeine and this is why you fell tired after coffee.
    Instant coffee is much worse in that respect because it contains more theobromine than natural.
    You might heard about 30th km effect when truck drivers crash their trucks in the same place on motorway after they left their starbucks. This happens because theobromine kicks in and makes them sleepy.
    Tea doesn’t have theobromine this is why it doesn’t put you asleep.

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