According to a new research in Norway involving 53,000 subjects, chronic insomnia may increase the risk of heart attack. After adjusting for individuals’ health and lifestyle factors, the study found that compared to people who never have sleep problems, those who have difficulty falling asleep had a 45 percent increased relative risk of heart attack. People with problems staying asleep had a 30 percent increased risk, and those who woke up tired a 27 percent increase.
The researchers did not control for sleep apnea, which is already known to be associated with cardiovascular illness, but they did control for body mass index and blood pressure, two factors highly linked to such a disorder.
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