Associations between self‐reported sleep duration and sleeping disorder with concentrations of fasting and 2‐h glucose, insulin, and glycosylated hemoglobin among adults without diagnosed diabetes (在未诊断糖尿病的成年人中自我报告的睡眠时间、睡眠障碍与空腹及餐后2小时血糖、胰岛素以及糖化血红蛋白浓度之间的关系)