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A new study in the European Health Journal looked at 116,632 adults in 21 countries
Do you oversleep? If so, that could be a problem.
The amount of time you sleep, which includes daytime naps, is linked to your risk of developing cardiovascular disease and early morbidity, according to a study of over 116,000 people in seven regions of the world, published in the peer-reviewed European Heart Journal on Wednesday.
This conclusion appeared to contradict a slew of studies suggesting people should always get more, not less, sleep. They found that people who slept for longer than the usual 6 to 8 hours a day had an increased risk of dying or developing diseases of the heart or blood vessels in the brain.
Compared to those who slept for the recommended time, people who slept 8 to 9 hours a day had a 5% increased risk of those ailments and early death. while those sleeping between 9 and 10 hours a day had an increased risk of 17% and people sleeping 10 hours a day or more had a 41% higher risk.
“The optimal duration of estimated sleep is 6 to 8 hours per day for adults,” said Chuangshi Wang, a PhD student at McMaster University in Canada and Peking Union Medical College, Chinese Academy of Medical Sciences, China. He cautioned that the results show correlation, not causation.
This study looked at 116,632 adults aged between 35 and 70 years in 21 countries with different income levels in 7 geographic regions (North America and Europe, South America, the Middle East, South Asia, Southeast Asia, China and Africa). They were part a study that started in 2003.
During an average follow-up time of nearly eight years, 4,381 people died and 4,365 suffered a major cardiovascular problem such as a heart attack or stroke. The researchers adjusted for age, sex, education, smoking, alcohol consumption, lifestyles and their family health history.
Some good news from the study: Daytime napping helped people who slept under 6 hours per night catch up on their sleep and lower the risks of death or cardiovascular problems associated with not getting enough sleep. (The researchers, however, did not collect data on insomnia and apnoea.)
Research published in August suggests people should get between 6 and 8 hours sleep. Epameinondas Fountas, cardiology specialty registrar at the Onassis Cardiac Surgery Centre in Athens, Greece, said that’s a “sweet spot” and the most beneficial for a healthy heart.
President Donald Trump doesn’t get much more than 40 winks. The president gets 4 to 5 hours sleep a night. The late British Prime Minister Margaret Thatcher famously claimed to get 4 hours per night, bolstering her image as “The Iron Lady.” Some historians have cast doubt on that.
However, Fountas also said too much sleep can be detrimental, as well as too little. “We spend one-third of our lives sleeping, yet we know little about the impact of this biological need on the cardiovascular system,” he said. He studied the relationship between sleep duration and cardiovascular disease.
This “meta-analysis” released last July included 11 prospective studies of more than 1 million adults without cardiovascular disease published within the last five years. The research found that both short and long sleepers had a greater risk of developing or dying from coronary artery disease or stroke.
“The relationship between sleep and mood is complex, because disrupted sleep can lead to emotional changes, clinical depression or anxiety, but these conditions can also compound or further disrupt sleep,” according to the National Sleep Foundation. In other words, is the reason for oversleeping the reason for underlying health problems?