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The link between insomnia and cardiovascular disease


Nov. 19, 2019 Medical News Today

Insomnia is a relatively widespread problem. When a person has insomnia, they often struggle to fall asleep or stay asleep. Some people experience both.

Around 1 in 4 adults in the United States experience short-term, or acute, insomnia every year, according to research carried out at the University of Pennsylvania, PA. Acute insomnia typically means that a person experiences sleep problems for just a short period, perhaps due to stress or worry.

Approximately three-quarters of these people return to their regular sleeping patterns. Others, however, go on to develop chronic insomnia.

Chronic insomnia refers to a person who experiences problems sleeping for at least 3 nights a week for no less than 3 months.

Both acute and chronic insomnia can result in daytime drowsiness, concentration and memory problems, and a lack of energy.

But studies have found more worrying links. One recent analysis, appearing in Sleep Medicine Reviews Trusted Source, linked insomnia to the onset of depression, anxiety, and alcohol misuse. Other studies have found a relationship between insomnia and heart disease.

Now, authors of a new study, published in Neurology, point out that previous research has failed to define insomnia correctly and has included people who may not have the disorder. So they set out to find a stronger association.

Tracking insomnia

The results of the new paper suggest that identifying insomnia, particularly in young people, may reduce cardiovascular disease risk later on in life.

The researchers used data from the China Kadoorie Biobank, which investigates and tracks the leading causes of chronic diseases in China.

The participants, aged between 30 and 79, had no history of heart disease or stroke when the study commenced.

In the new study, the researchers analyzed three symptoms of insomnia, where the symptoms lasted at least 3 days a week. The symptoms were: problems falling asleep or staying asleep, waking too early, or struggling to focus during the day because of disrupted sleep.

The data show that 11% of the participants reported trouble falling or staying asleep, and 10% had problems with waking up early. Only 2% of the participants reported having focusing issues during the day.

The researchers followed all of the volunteers for about a decade. During that time, they identified 130,032 incidences of heart attack, stroke, and comparable diseases.

A higher chance of cardiovascular disease

After taking into account other risk factors, such as smoking and alcohol consumption, researchers identified several significant findings.

The new study identified that the participants who reported experiencing all three insomnia symptoms had an 18% increased chance of developing cardiovascular diseases compared with those who did not experience the symptoms.

Those who reported trouble focusing during the day were 13% more likely to develop heart attack, stroke, and comparable diseases than people who did not have problems focusing.

Researchers identified that the people who found it difficult to fall asleep or stay asleep had a 9% higher chance of developing these diseases, while those who woke up too early were 7% more likely to experience a stroke, heart attack, or similar.

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