Getting too much sleep can be just as dangerous as having too little

How much sleep do you think you need? You may not be the best assessor there.

President Donald Trump does not get much more than 40 winks. The president gets 4 to 5 hours of sleep per night. The late British Prime Minister Margaret Thatcher claimed to be famous for 4 hours a night, and to strengthen her image as "The Iron Lady". Some historians have expressed doubts about this.

But new research suggests that people have to get sleep between 6 and 8 hours. Epameinondas Fountas, specialist cardiology at the Onassis Cardiac Surgery Center in Athens, Greece, said that this is a "sweet spot" and the most beneficial for a healthy heart, and more or less harmful.

"We spend a third of our lives sleeping, but 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 with the help of a statistical tool to analyze the results of previous studies on the subject.

We spend a third of our lives sleeping, but we know little about the impact of this biological need on the cardiovascular system. & # 39;

-Epameinondas Fountas, specialist in cardiology specialties at the Onassis Cardiac Surgery Center in Athens, Greece

This & # 39; meta-analysis & # 39; released on Sunday included 11 prospective studies of more than 1 million adults without cardiovascular disease published in the past five years. The study showed that both short and long sleepers had a greater risk of developing or dying of coronary artery disease or stroke.

Moa Bengtsson, a researcher at the University of Gothenburg, also released similar research last weekend which concluded that middle-aged men who sleep 5 hours or less per night are twice as likely to develop a major cardiovascular event in the next 20 years than men who sleep 7 to 8 hours.

Do not miss it: 5 ways of sleep deprivation can change the course of your life

Lack of sleep is an "epidemic of public health" in the US, according to the Centers for Disease Control and Prevention. Those who have long-term lack of sleep are also more likely to suffer from hypertension, diabetes, depression and obesity, and cancer, increased mortality.

Previous research suggests that some people have a tendency to sleep less, regardless of health outcomes. A study from 2014 in the journal Sleep said that people with a gene variant p.Tyr362His – a variant of the BHLHE41 gene – can function at 5 hours of sleep per night.

Nevertheless, CDC research shows that almost a third of American adults get less than seven hours of sleep and people overestimate the amount of sleep time by about 45 minutes. People throw and turn before they fall asleep, worry about their day and can even sweep away on their smartphones.

People with sleep disorders also feel lonely and less inclined to deal with others, according to a study by researchers at the University of California, Berkeley, that was published earlier this month in the journal Nature Communications.

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