Healthy sleep should last from six to eight hours a day, an international team of scientists said. Their research is published in the journal of the European Society of Cardiology.
The observations lasted for about eight years, experts analyzed the sleep diaries of more than 116 thousand people aged 35-70 years. As a result, they concluded that sleep overload is associated with an increased risk of death from diseases of the cardiovascular system.
So, for those who slept from eight to nine hours, the risk of death increased by five percent compared with those who rested the recommended number of hours. Sleep from nine to ten hours increases the likelihood of developing a serious disease by 17%, and more than ten hours – by 41%.
According to scientists, daytime sleep also provokes the development of heart disease, if at night a person sleeps for less than six hours. But they note that in most cases, lack of sleep is compensated in this way and the indicator rises to the optimum.