Myth 1: Coffee can be addictive: this sentence has a certain authenticity, but it depends on your understanding of "addiction". For the central nervous system, coffee is a stimulant, often drinking coffee, the body can have a mild dependence on it. But coffee will not be harmful to physical and mental health like other addictive medicines. But if you stop drinking coffee suddenly, there may be symptoms such as headaches, fatigue, anxiety, irritability, depression, and inability to concentrate, but these symptoms will only last for a few days. Myth 2: Coffee can cause insomnia: the body absorbs caffeine as soon as possible and digests it quickly. Caffeine has a short half-life. Generally only 4-5 hours to consume half of the body of coffee, 8-10 hours later, the body of caffeine consumed 75%. So if a person drinks coffee in the morning, the night's sleep will not be affected. But if you drink coffee at night, sleep may be affected. Most people drink coffee 6 hours before bedtime and do not affect sleep. However, depending on the metabolism of each person, its sensitivity is also different, drink the amount of coffee is different, the impact is different. Too sensitive people drink coffee, not only insomnia, but also neurotic and gastrointestinal discomfort.