Clinical Edge

Summaries of Must-Read Clinical Literature, Guidelines, and FDA Actions

Sleep Duration & Cardiometabolic Health in Adults

Sleep Health; ePub 2017 Apr 23; Kanagasabai, et al

Optimal cardiometabolic health in adults may be achieved with 7 hours of sleep per night, supporting recent sleep duration recommendations, a recent study found. Using cross-sectional data from the 2005-2012 National Health and Nutrition Examination Survey, the study included 8,827 participants aged ≥20 years and sought to determine if the association of sleep duration and cardiometabolic risk score varies by subgroups. Researchers found:

  • 7 hours of sleep was associated with the lowest cardiometabolic risk score.
  • This score remained similar after adjusting for age, sex, ethnicity, education, family income, alcohol intake, and smoking status.
  • 8 hours of sleep was associated with the lowest cardiometabolic risk score in non-Hispanic blacks.


Kanagasabai T, Chaput JP. Sleep duration and the associated cardiometabolic risk scores in adults. [Published online ahead of print April 23, 2017]. Sleep Health. doi:10.1016/j.sleh.2017.03.006.


This study looked at the relationship between sleep duration and cardiometabolic health as assessed by measurement of HDL cholesterol (HDL), waist circumference (WC), fasting insulin, fasting plasma glucose (Glu), triglycerides (TG), body mass index (BMI), systolic blood pressure (SBP) and diastolic blood pressure (DBP). The problem with studies like this is that while it appears that 7-8 hours of sleep is correlated with optimal cardiometabolic health, it is likely that the optimal sleep duration varies by individual, with different people optimally needing different amounts of sleep. Nonetheless, this study supports a benefit for most people need 7-8 hours of sleep per night. —Neil Skolnik, MD