title_body: How to increase your caffeine sensitivity?
upvoted_answer: Over the years I developed a caffeine addiction that reached fairly severe levels.  For background, the addiction ramped into high gear the summer after my freshman year of college (summer of '99) when I was consuming somewhere between 60 and 100 ounces of coffee per day.  I tried to quit cold-turkey once, and spent two weeks mostly bouncing a rubber ball off the wall of my dorm room before I decided the addiction itself wasn't even that bad.
  
  Eventually I needed to do something about it, and I went with the only logical method: I slowly backed down my consumption, from about five to seven cups per day at the time to a hard limit of two.  I also forced myself to stop consuming any coffee after about 11:00am.
  
  I did all this over a six-week period.  That kept the headaches away, and decreased my dependence on the drug.  However, I had to maintain at that level for several more months -- probably about six or so -- for my sensitivity to caffeine to go back up.  Now, when I drink a cup in the morning, it has the desired effect: it perks me up and prepares me for my day.  It's no longer a crutch, it's simply a pick-me-up I enjoy.
  
  In summary: back down your caffeine intake, whatever the delivery method you prefer, by 10 to 20 percent each week until you reach a more manageable level, then hold at that level for several months.  That will increase your sensitivity.