Chronic lack of sleep harms health - this has long been known. But is it dangerous to sleep not too little, but too much? We decided to figure it out.

News regularly appear in the media: supposedly scientists provedthat there is too much to sleep the same harmfulhow to lack. List even specific problems that supposedly causes sleep in large doses: headaches, diabetes And even Alzheimer's disease. This can be read even on sites, selling mattresses and sofas.

Doctors Recommend Adults sleep at least seven hours a day. Schoolchildren It is permissible to sleep for 9-11 hours, and the elderly may have enough six hours of sleep. Deciding how much to sleep, it is important to focus on your feelings: you are peppy after sleep or sluggish. But those who sleep less than the time they need, more often Health problems begin than those who get enough sleep.

Non -sleeping people are more inclined To obesity, they have a higher chance to become smokers than those who sleep “at normal” - from seven hours. In a dream, blood pressure usually decreases, so lack of sleep is also associated with high blood pressure. And it, in turn, causes heart problems. American Cardiological Association calls lack of sleep among the causes of cardiovascular diseases.

Another chronic lack of sleep can lead to the fact that the body will be worse react On insulin. That is, the blood sugar level will increase, and the risk of diabetes will increase. Noticedthat those who sleep a lot are faced with similar problems. The same risk of obesity is increased in those who sleep nine hours a day or more, revealed the study.

There is evidence that the risk of heart disease in sleeping is too much increased. The authors published in 2013 for almost 13 years followed 135,000 people. The risk of death from cardiovascular diseases was increased And those who slept less than five hours a day, and those who slept longer than nine hours. And the study among women of middle and elderly showed: those who slept and too few and too much, more often observed Disorders of thinking.

Many scientific studies have been conducted that reveal the connection of abnormal (in a smaller or larger) sleep and increased risk of mortality. Scientific work, which Summed 17 studies about a dream, revealed: if you draw a mortality schedule depending on the length of sleep, it will turn out in the form of the letter U. That is, the risk of early death increases in those who deviate from normal sleep time - in any direction. The risk of dying with lack of sleep was 12% higher than those who slept 7-8 hours. And in sleeping for too long the risk of death is increased by as much as 30%.

So, scientists find the correlation between too long and a deterioration in health. But this does not mean that a long dream is harmful in itself. What is the reason, and that the consequence is early to say.

“There is a correlation, but it may not be a causal relationship,” the somnologist of the Russian clinic explained “verified” "Dawn" Elena Lyashenko. - That is, it cannot be said that a lot to sleep is harmful. But people who sleep more than 10 hours a day have increased the risk of death. This may be due to the fact that sick people sleep more and sick people are more likely to die. "