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OBJECTIVE The purpose of the study was to assess the relationship of napping and nighttime sleep with impaired glucose regulation (IGR), insulin resistance and glycated hemoglobin (HbAlc) in Chinese middle-aged adults without diabetes.RESEARCH DESIGN AND METHODS This crosssectional study included 7568 adults aged 40-65years inFujianprovince,Chinafrom June 2011 to January 2012.