Scientifically speaking, the reason for this is that caffeine binds to adenosine receptors in the body. Adenosine acts as a neuromodulator for most of our important neurochemicals (serotonin, dopamine, norepinephrine), and two things happen when you're regularly filling your adenosine receptors with caffeine: first, your body becomes more sensitive to adenosine itself, and second, your body down-regulates the amount of these neurotransmitters that you have available.

This means that in the absence of caffeine, you're going to experience the side effects of low serotonin and dopamine, which are depression, irritability, tiredness, cravings, etc. Adenosine is also a vasodilator, which will have the opposite affect of most stimulants, including caffeine. (source)

Anecdotally speaking, yes. I find that a spoonful of coconut oil, butter, or ghee gives me much more pleasant of a buzz than caffeine does these days.

As for increased sensitivity after going paleo, I imagine it may have something to do with adenosine's role in ATP production.

During the cool season (being from the north I'd never call southern Nevada cold) I enjoy a couple mugs of coffee every morning. When it starts getting hot I lose interest and don't drink any.

I used to wake up groggy but I believe that was a wheat hangover. Now, with or without coffee I wake up alert and high energy and there's no hurry about getting the coffee going. I do enjoy sitting with a warm mug to sip though.

The only reason to lessen caffeine intake is because you fear greatness.

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