rach:

New York Magazine delves into why we love the jolt of morning coffee—and if that’s a good thing or not. Apparently we are all killing our insides and crashing like propellerless planes because of the stuff. But then, it’s also good for you. But not if you’re nursing. Or needing sleep. Or slightly crazy. 

I notice a great difference in my energy levels if I don’t drink coffee for a day. I am really sluggish, my mental alertness is noticeably down and I am probably more irritable. Damn, I should have had a coffee yesterday.