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Regular sleep for more than 9 hours can indicate the imminent appearance of serious illnesses
Undiagnosed serious illnesses, including cancer, which are characterized by pathological fatigue, can increase the duration of sleep.
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The risk of dying from cardiovascular disease is higher in people who sleep more than the norm, which is six to eight hours a day. This was shown by a major new study published in the European Heart Journal.
The authors reviewed data from 21 countries. The main finding was that those who regularly sleep more than 10 hours a day have a 41% higher risk of heart attack and stroke compared to those who sleep six to eight hours. For those who slept between eight and nine hours, the figure was 17%.
The question of cause-and-effect relationships remains open: most likely, existing diseases increase the need for sleep, and it is not an excess of sleep that leads to disease.
Scientists have also found an increased risk among those who have a habit of sleeping during the day without getting enough sleep at night. They noted that naps during the day can indicate fatigue and fatigue associated with painful conditions, which over time can lead to serious illness.
The lack of sleep itself, according to this study, increased the likelihood of cardiovascular accidents by 9%. But the authors did not consider this finding statistically significant.
The study surveyed 116,632 people between the ages of 35 and 70 in 21 countries. Participants were followed up for an average of 7.8 years.
Professor Francesco Cappuccio of Warwick University, who was not involved in the study, said that undiagnosed serious illnesses, including cancer, which are characterized by pathological fatigue, can increase sleep duration.