Coffee common sense "good coffee" doesn't keep you awake all night.

Coffee keeps people awake? In fact, good coffee is not so exciting, of course, in terms of physique, but also in terms of the quality of coffee to drink. Today we will analyze in detail whether you can't sleep all night after drinking coffee.

First: in the normal physique, after drinking coffee, the half-life of caffeine in the body is about three hours. After the half-life, the stimulation to the body or nerves is negligible. If you drink coffee, a large amount of water is replenished and drained. It may not stay in the body for more than two hours, how can you sleep all night?

Second, we should professionally analyze the quality of the coffee we drink.

Coffee contains a variety of ingredients, extraction is not to extract all of these ingredients, there is usually such a rule: if the amount of coffee powder is fixed, the amount of extraction of soluble ingredients is determined by grinding degree and time. The finer the grinding degree of coffee powder is, the longer the extraction time is, the more ingredients will be obtained. According to the experiment, if all the ingredients that can be extracted from the quantitative coffee powder are extracted, up to 30% of the ingredients can be extracted. But not all of these ingredients are what we need. Coffee has ingredients that we need as well as ingredients we don't need, and the longer it takes to extract, the easier it is to extract bad ingredients that we don't need.

In other words, if incorrect operation, or incorrect coffee extraction, will cause the precipitation of irritating substances.

Among these ingredients, the main representative of the least needed ingredient is "tannin", which should be called tannic acid. Raw coffee beans contain 8%-9% and roasted raw beans contain 4%-5%. Like caffeine, it has the property of being decomposed at certain baking degrees. When baked to a depth around French or Italian baking, 90% of the tannins are broken down.

Most people will think that deep-roasted coffee is strong and light-roasted coffee is weak, this idea is completely wrong, mistakenly thinking that light-roasted coffee is less irritating, and if you quote it before going to bed, it will make you open your eyes until dawn! The deeper the baking degree, the less caffeine and tannin. The irritation will also diminish. Don't be fooled by the appearance color of the coffee.

The tannins we don't want to extract are also responsible for the astringency of coffee. Tannins are angels and demons, a small amount of tannins can play the sweet and mellow thickness of coffee, a small amount of coffee tannic acid also has a wide range of antibacterial effects! But incorrect roasting or shallow roasting plus wrong extraction causes an increase in the amount of tannins, and the devil plays a role, not only making the coffee astringent, but also keeping you awake all night.

The irritation of coffee is not only caused by the maker or roaster, but also by the wrong drinking method of the drinker. Coffee needs to be drunk quickly, preferably when the remaining temperature of coffee still exists. The irritation of coffee is often released with the decrease of coffee temperature.

Therefore, good coffee, that is, under the premise of correct baking, correct operation, correct extraction, timely drinking, can reduce the irritation of tannins or caffeine, even if you drink coffee at night, you can also have a good night's sleep.