OSLO-Scientists discover that sleeping less than four hours or more than eight hours can lead to heart disease and even early death.
They claim that sleeping less than four hours increases risk of heart disease by 36% and more than eight hours increases the risk by 28%.
Their findings reveal a fine line between a healthy night’s sleep and shut eye habits that could increase the risk of early death.
Anything less than four hours sleep is deemed detrimental to a person’s cardiovascular health.
A lack of sleep is known to be linked to stress responses that increase heart rate, blood pressure and the secretion of the hormone adrenaline – all risk facts for heart disease.
Yet, the new study, by experts in Norway and Taiwan, found those people who sleep for more than eight hours a night also faced a higher risk.
However, it is not yet known why spending more time between the sheets negatively impacts on the heart.
he study identified no increased risk with sleeping between four and six hours a night, or between six and eight hours.
Yet, researchers found the risk overall was greater for women than men.
Study author Dr Linn Beate Strand, of the Norwegian University of Science and Technology, said: ‘Our results show that enough, but not too much sleep, is important for a healthy lifestyle.’
Doctors asked 392,164 adults in Taiwan who came in for medical checkups between 1998 and 2011 how much they slept at night.
During a follow-up period, the scientists discovered that 711 of those patients died of cardiovascular disease.
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