Sleep duration as a risk factor for incident type 2 diabetes in a multiethnic cohort.

Purpose: We evaluated the association between sleep duration and type 2 diabetes in a multiethnic cohort, considering insulin sensitivity (S(I)) and secretion (acute insulin response [AIR]), two important diabetes risk factors.

Methods: Among 900 diabetes-free persons, 146 developed incident type 2 diabetes. At baseline, sleep duration was assessed by self-report and S(I) and AIR by a frequently sampled intravenous glucose tolerance test.