I feel ya on enjoying coffee in the afternoon (I often don't even brew my first cup til then). So far, my only weird coffee reaction is that if I drink more than a pot's worth, I want a nap..

Have you tried bulletproof coffee (it's the coffee version of Tibetan butter tea)? Not only is it super delicious, but the added fat makes the coffee metabolize differently (I notice sustained mental acuity, and a slower, steadier release of the caffeine).

May you find a good balance to enjoying the deliciousness of both coffee and sleep!