Today,one way valve tells you a story about caffeine. In the 3rd century to the 8th century AD, a shepherd Kaldi discovered the coffee from a place of Ethiopia; the observant shepherd found his sheep after eating coffee fruit could not sleep, and he took these fruits to find a local monastery dean. The monastery dean planted the first batch of coffee and recorded it can enhance the effectiveness of the brain. "After that, people began to love caffeine. About caffeine, some of effects are very strange, and its effect on the brain has far exceeded the human expectations.
In fact, caffeine does not affect the sleep of the majority people, the shepherd Kaldi's observation of his sheep may be correct, but it may not correct for humans. Though people believe that caffeine and sleep have Inseparable relationship, and there is less evidences to prove this relationship is right.
The experimental results show that majority people know how to use caffeine, and it is not difficult to use a little amount, only if you do not drink black coffee at midnight. There are some experiments make people which unaware of the circumstances to intake of caffeine and sleep, so many people are surprised that caffeine did not affect the sleep of these people. People always blame caffeine caused their bad sleeping, and they deem that caffeine not only affects sleep, but also harmful to the body. And they blamed all kinds of unknown symptoms caused by caffeine, such as: palpitation, headache, high blood pressure and so on.