['To examine the association between insomnia with short sleep duration and hypercholesterolemia in Taiwanese adults.', 'Previous studies mostly focused on the association between sleep duration and hyperlipidemia, but the results were not consistent. Besides, very few studies extensively examined the association between insomnia and hypercholesterolemia. This study hypothesized that insomnia with short sleep duration is associated with hypercholesterolemia.', 'Secondary data analysis. This study analysed the latest database of the cross-sectional Nutrition and Health Survey in Taiwan which was released on 2011 (data collected between 2005-2008) and collected data using stratified three-staged probability sampling design.', 'This study analysed 1533 participants aged between 19-64 (733 males and 800 females) and used logistic regression model to calculate the odds ratio and the 95% confidence interval of insomnia with short sleep duration to hypercholesterolemia. Controlled confounders included age, gender, sample weight, body mass index, waist circumference, fasting plasma glucose, hypertension and diabetes.', 'Insomnia with 5-6\xa0hours of sleep duration was significantly associated with hypercholesterolemia. The odds ratio of mild insomnia or moderate/severe insomnia with 5-6\xa0hours of sleep duration to hypercholesterolemia was higher, compared with the reference group (without insomnia and >6\xa0hours of sleep duration).'] Is the relationship between insomnia with short sleep duration associated with hypercholesterolemia : a cross-sectional study?