"Sleep patterns have previously been reported to be associated with a range of chronic medical conditions," said Stephen MacMahon, a cardiovascular expert at Oxford University's George Institute for Global Health, who was not involved in the study.
"Some, but not all, these associations will reflect the effects of underlying chronic disease on sleep rather than the converse. It's often difficult to untangle what is cause and effect, especially when some serious conditions, such as coronary heart disease, can be largely symptom-free for decades prior to a critical complication such as a heart attack," he told the Science Media Centre (SMC) in London.
Naveed Sattar, Professor of Metabolic Medicine at the University of Glasgow, said that while the study was "somewhat interesting", it seems that those who nap once or twice a week have healthier or organized lifestyles, but that those who napped daily were likely to be more sick.
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