Why does the coffee before going to bed has an invigorating effect on the person and how it is related to time zones and the human circadian rhythms, says science department “Gazety.Ru».
It’s no secret that a cup of coffee in the evening – one of the obvious ways to overcome sleepiness. However, the mechanism of this phenomenon for a long time could not explain. Make it attempted to British researchers from the University of Cambridge, along with their American counterparts. With the withdrawal of the Anglo-American group of researchers can be found in an article that published in the prestigious journal Science Translational Medicine.
In the course of their research, scientists learned that caffeine is the most popular stimulant in the world strikes at the human biological clock. The normal circadian rhythms synchronized with a 24-hour cycle, but the use of 200 mg of caffeine, i.e. cups double espresso desynchronization occurs biological clock.
Simply put, the human biological clock begin late for forty minutes. The man seemed to move one time zone back.
Despite the seeming simplicity of the findings, the researchers had to spend a remarkable manipulation to confirm them. To do this, scientists have gathered volunteers from both men and women and put them in a lab with no windows and hours. The test carried out in this dark room for seven weeks before scientists released them from there. During the experiment, the participants were fed pellets – every day before going to bed, they received either 200 mg pill with caffeine or placebo. Naturally, the study participants were not informed which of the two types of pellets are obtained. Moreover, in a laboratory, isolated from the outside world, scientists are constantly “Tinkering” with light, every day changing the intensity of light in the room before subjects went to bed.
The volunteers regularly took saliva samples for analysis – the aim of the researchers was to establish the concentration of melatonin in it: a hormone that is produced by the body before going to bed, and makes a person feel drowsy.
Scientists have noticed that taking pills with caffeine before sleeping makes the body an effect similar to when a person moves to another time zone back.
On average, a dream deferred for forty minutes, but some subjects circadian rhythms shifted by two hours. Coffee drinker a man like the spotlight for three hours.
«At first glance, everything is simple. But studies proving the effect of caffeine on the human circadian rhythms, have been conducted. Now I understand why a lot of complex sleep after coffee – they seem to have moved one time zone to the west, “- said one of the study’s authors, Professor John O’Neill.
In this way, the coffee can be used to combat jet lag. The researchers suggest drinking it to those who fly to the west – this will help to synchronize the circadian rhythms of passengers to the time zone of the destination. However, the recommendation is to make it impossible, as a failure of circadian rhythms of human faces with various diseases: from ordinary colds to cancer or Alzheimer’s disease. In addition, researchers already proven , which tangled the biological clock can trigger miscarriages. So the quality and duration of sleep better watch out and do not conduct experiments on himself with the help of caffeine or not.
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