Ahhhh! The smell of freshly ground coffee in the morning. All by itself, that’s enough of an incentive to lure anybody out of bed — even those insomniacs who have managed just a few scant hours of sleep. But caffeine works so well because it’s a stimulant — a little helps you perform well; too much brings on the jitters, throwing you into that hyper-aware, extra-awake state. If you have insomnia, coffee,...
