Should I Cut Down On Coffee?

I enjoy coffee. Any coffee. My usual intake is 2 cups a day. I go up to 3 cups if I am feeling sad and just want something comfortable. Also, I do sometimes wake up in the middle of the night and cannot get back to sleep. Should I cut back on the number of cups per day? Or should I do it for my heart? ~ Links: Less Coffee, Better Sleep, by Viktor Löfgren, Marginalia Scientists Reveal Why Up to 5 Cups of Coffee a Day May Benefit Heart Health, by Amanda Castro, Newsweek