Irritability and anxiety are the most commonly seen emotional effects of caffeine, but caffeine enables all of your emotions to take charge.
The negative effects of a caffeine-generated adrenaline surge are not just behavioral. Researchers at Carnegie Mellon University found that large doses of caffeine raise blood pressure, stimulate the heart, and produce rapid shallow breathing, which readers of Emotional Intelligence 2.0 know deprives the brain of the oxygen needed to keep your thinking calm and rational.
The Ugly: Sleep
When you sleep, your brain literally recharges, shuffling through the day’s memories and storing or discarding them (which causes dreams), so that you wake up alert and clear-headed. Your self-control, attention, and memory are all reduced when you don’t get enough—or the right kind—of sleep. Your brain is very fickle when it comes to sleep. For you to wake up feeling rested, your brain needs to move through an elaborate series of cycles. You can help this process along and improve the quality of your sleep by reducing your caffeine intake.
Here’s why you’ll want to: caffeine has a six-hour half-life, which means it takes a full twenty-four hours to work its way out of your system. Have a cup of joe at eight a.m., and you’ll still have 25% of the caffeine in your body at eight p.m. Anything you drink after noon will still be at 50% strength at bedtime. Any caffeine in your bloodstream—with the negative effects increasing with the dose—makes it harder to fall asleep.
When you do finally fall asleep, the worst is yet to come. Caffeine disrupts the quality of your sleep by reducing rapid eye movement (REM) sleep, the deep sleep when your body recuperates and processes emotions. When caffeine disrupts your sleep, you wake up the next day with an emotional handicap. You’re naturally going to be inclined to grab a cup of coffee or an energy drink to try to make yourself feel better. The caffeine produces surges of adrenaline, which further your emotional handicap. Caffeine and lack of sleep leave you feeling tired in the afternoon, so you drink more caffeine, which leaves even more of it in your bloodstream at bedtime. Caffeine very quickly creates a vicious cycle.
Like any stimulant, caffeine is physiologically and psychologically addictive. If you do choose to lower your caffeine intake, you should do so slowly under the guidance of a qualified medical professional. The researchers at Johns Hopkins found that caffeine withdrawal causes headache, fatigue, sleepiness, and difficulty concentrating. Some people report feeling flu-like symptoms, depression, and anxiety after reducing intake by as little as one cup a day. Slowly tapering your caffeine dosage each day can greatly reduce these withdrawal symptoms. April 2012
ABOUT THE AUTHOR:
Travis Bradberry, Ph.D.
Dr. Travis Bradberry is the award-winning co-author of the #1 bestselling book, Emotional Intelligence 2.0, and the cofounder of TalentSmart, the world's leading provider of emotional intelligence tests and training, serving more than 75% of Fortune 500 companies. His bestselling books have been translated into 25 languages and are available in more than 150 countries. Dr. Bradberry has written for, or been covered by, Newsweek, BusinessWeek, Fortune, Forbes, Fast Company, Inc., USA Today, The Wall Street Journal, The Washington Post, and The Harvard Business Review.