Too much or too little sleep is linked to chronic disease in adults age 45 and older, according to a new study conducted by the Centers for Disease Control and Prevention.

Published in the October issue of the journal Sleep, the study reported that people who sleep six hours or less on average had a higher prevalence of coronary heart disease, stroke, diabetes, obesity and frequent mental distress compared with people who sleep the optimum amount of seven to nine hours on average in a 24-hour period.

A similar higher prevalence of coronary heart disease, stroke and diabetes were also found for people who sleep 10 or more hours.

The study involved more than 54,000 participants age 45 or older in 14 states. Thirty-one percent of the participants were identified as sleeping six hours or less on average. More than 64 percent were classified as optimal sleepers. Only 4 percent of participants were long sleepers.

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