Relationship between sleep duration and body mass index depends on age.

Objective: Sleep duration is associated with obesity and cardiometabolic disease. It is unclear, though, how these relationship differs across age groups.

Methods: Data from 2007 to 2008 National Health and Nutrition Examination Survey (NHANES) were used, including respondents aged 16+ with complete data (N = 5,607).

Sleep duration versus sleep insufficiency as predictors of cardiometabolic health outcomes.

Objective: The objective of the present study was to investigate the relationship between sleep insufficiency and sleep duration, particularly regarding negative cardiometabolic health outcomes already considered to be affected by reduced sleep time.

Methods: A total of N=30,934 participants from the 2009 Behavioural Risk Factor Surveillance System (BRFSS) answered questions about their sleep duration as well as subjective feelings of sleep insufficiency. Outcomes included body mass index (BMI), obesity (BMI ≥ 30kgm(-2)) and history of hypertension, diabetes, hypercholesterolaemia, heart attack and stroke.