This scientists have found.
Doctors recommend that adults sleep 6-8 hours per night. But if you sleep longer, it increases the risk of death and cardiovascular disease, according to a global study published on Wednesday in the European Heart Journal.
As reported by CNN, researchers analyzed data from 21 countries in seven different regions, and came to the conclusion that those who sleep longer than the recommended eight hours, up to 41% increased risk of stroke and heart failure, and death.
However, it is possible that people sleep longer because of the presence of a disease, which in itself increases the risk cardiovascular disorders and mortality.
A team of scientists under the leadership Chuanshi Wang from Beijing also found an increased risk in people who sleep during the day.
“Daytime sleep is associated with an increased risk of serious cardiovascular disease and death in those who sleep more than 6 hours a night, but not those who sleep less than 6 hours,” Wang said.
Those who have enough sleep at night, daytime sleep compensates for lack of sleep a night, decreasing risk, explains van.
Previous studies on this topic were conducted mainly in North America, Europe and Japan. This is the first study on a global scale.
However, the results are purely empirical, that is the reason for this connection is unknown.
“Although this is very interesting results, they do not prove a causal relationship,” says the British nurse Julie ward, who also participated in the study.
Previously, scientists have proved that sleep duration less than 5 hours a day increases the risk of heart attacks by 45%. Lack of sleep can also contribute to the development of diabetes. Studies have shown that the transition from 8-hour to 4-hour sleep the body begins to slowly assimilate glucose, and its level begins to rise.
The previous study of this issue was conducted by British scientists from the University of Kiel. This was accomplished through the combined analysis of 74 studies involving a total of about 3 million people.
According to the British, longer sleep (more than 8 hours per day) increased the risk of premature death and heart attacks to a greater degree than the lack of sleep. 9-hour sleep increased the risk of total mortality by 14%, 10-hour sleep for another 30%, while those who slept more than 11 hours by 47%. Participants with complaints of poor sleep risk of coronary heart disease increased as much as 44%.
However, the researchers came to the conclusion that it is harmful not only a long sleep, but its poor quality.
Poor, interrupted sleep was associated with increased risk of coronary disease by 44 %.
“Sleep can have an ambiguous effect on human health, says Dr. Chun Shing Kwok, a cardiologist at the University of Kiel. In our study, we did not plan to study the mechanism of influence of sleep on health.
A longer duration of sleep may be a sign of apnea (breath holding during sleep), hypothyroidism, anemia or congestive heart failure. Sleep can also affect hormone levels, mood, stress level, blood pressure, appetite and weight.”
In short, one thing is clear: if you care about your health, sleep is necessary!
How many hours do you sleep?