Coffee is the most popular way people do to kill drowsiness. This is because of the caffeine content in coffee makes you feel more alert, refreshed and improve mood. Many studies have shown that caffeine can improve performance of cognitive function (memory, focus) a person in the short term.
In fact it is not entirely correct. Recent research from Johns Hopkins Medical School issued a surprising fact, caffeine was not really working can increase your cognitive performance. This study on cognitive performance improved by controlling the coffee drinking habits of the participants. In this study, the participants were tested for the people who used to enjoy 2-4 cups of caffeinated drinks which is equivalent to 200-800 mg of caffeine a day.
As a result, the study found that caffeine can be addictive. When used to enjoy caffeine, so when cognitive performance and mood are down then you think that only caffeine can make you excited again. Though caffeine does not actually improve your performance, but only a return to normal levels for a short time.
When drinking caffeine, your body releases adrenaline which is the source response to ‘fight or flight’, which indirectly force the body to return to work. However, when caffeine and adrenaline forcing the brain to work, the opposite will happen to your emotional level.
Caffeine influence on emotional behavior and make you irritable, or anxious. Based on studies conducted at Carnegie Mellon University said the adrenalin surge caused by caffeine also have negative consequences for the increase in blood pressure, excessive cardiac stimulation, palpitations and breathing more rapid and irregular. This can prevent the entry of oxygen into the brain needed to keep the mind calm and rational.
Affect the quality of sleep
Caffeine is also an impact on the quality of your sleep. In the body, caffeine has a ‘life time’ six and a half hours, this means it took 24 hours to back out caffeine from the body. When drinking caffeine at eight o’clock then caffeine will still remain 25 percent in the body until eight at night. And caffeine is added during the day, then you already have 50 percent of caffeine in the body through the night. Worse, any caffeine in the bloodstream will make you difficult to fall asleep.
When you finally fall asleep, caffeine will disrupt your sleep quality contains reduce rapid eye movement (Rapid Eye Movement / REM) during sleep so that sleep less soundly and so affect the level of emotion in the morning. Finally, when you wake up you feel you need another cup of caffeine to make you better and make adrenalin soaring again.
As with any stimulant, physiologically and psychologically addictive caffeine (addictive). So to avoid this, you should gradually reduce your caffeine intake in a day. However, researchers at Johns Hopkins found that the reduction of caffeine can make someone experience headaches, fatigue, drowsiness, difficulty concentrating, depression and anxiety after reducing the intake of caffeine one cup per day.
This does not mean you can not enjoy the caffeine altogether. Only the recommended levels of caffeine is one cup of caffeine per day or about 100 mg of caffeine. Be careful when enjoying coffee at coffee outlets, because the levels of caffeine in a single glass can reach 180-415 mg of caffeine per serving her.