A study in the Oct. 25, 2011 issue of Circulation: Journal of the American Heart Association, found that the risk of heart attack in people with insomnia ranged from 27 percent to 45 percent greater than for people who rarely experienced trouble sleeping. Insomnia was characterized in the study in three different ways: Having trouble falling asleep almost every night (45 percent higher heart attack risk); having problems staying asleep almost every night (30 percent higher risk); and not waking up feeling refreshed in the morning more than once a week (27 percent higher risk).
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