Insomnia increases risk of infarction

SLEEPLESS nights are associated with an up to 45% increased risk of myocardial infarction, a large prospective study shows.

The data came from 52,610 Norwegian adults who answered a national survey about their insomnia symptoms in 1995-97.

Over the next 11 years, using hospital records and Norway’s National Cause of Death Registry, the researchers identified 2368 people among them who had a first infarct.

After adjusting for factors including age, education level, blood pressure, cholesterol, diabetes, weight, shiftwork and depression, but not for obstructive sleep apnoea, researchers found a dose-response relationship between
lack of sleep and risk of myocardial infarction.

When they compared data from people who said they usually slept well to people who said they had trouble falling asleep almost daily over the past month, they saw a 45% higher risk in the sleepless group.

Those who said they could fall

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