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That's the conclusion of a new study that included more than 1,600 people in South Korea, aged 47 to 59, who provided information about their sleep habits and underwent tests to assess their health.
"Regardless of lifestyle, people who stayed up late faced a higher risk of developing health problems like diabetes or reduced muscle mass than those who were early risers," Dr. Nan Hee Kim, of Korea University College of Medicine in Ansan, South Korea, said in a news release from the Endocrine Society.
Of the 1,600 people in the study, 95 were night owls, 480 were early risers and the remainder fell somewhere in the middle.
Even though they tended to be younger, night owls had higher levels of body fat and fats in the blood than early risers. Night owls were also more likely to have sarcopenia, a condition where the body gradually loses muscle mass, the findings showed.
Men who were night owls were more likely to have diabetes or sarcopenia than those who were early risers, the investigators found. Compared to women who were early risers, women who were night owls tended to have more belly fat and a higher risk of metabolic syndrome -- a collection of health conditions that increase the risk of diabetes, heart disease and stroke.
The study was published online April 1 in the Journal of Clinical Endocrinology & Metabolism.
Considering that many younger people are night owls, the risk associated with this type of sleep habit is "an important health issue that needs to be addressed," Kim said.
The study found an association between being a night owl and increased health risks; it did not prove cause-and-effect.
-- Robert Preidt
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