Abstract
Disturbed sleep and nocturnal altered breathing are related to disturbances of glucose metabolism. The present uncontrolled observational study explores the role of these factors on the variability of fasting glycemia. The number and duration of nocturnal awakenings and the fasting glycemia of 97 patients with type 2 diabetes treated with diet, metformin, or gliptins were recorded over seven consecutive days. During the same time period, the main respiratory indexes-oxygen disturbance index, apnea/hypopnea index, and respiratory disturbance index-were recorded for one night. The three respiratory indexes and the number of nocturnal awakenings are highly correlated with the coefficient of variation of the fasting blood glucose recorded over the 7-day period at p < .005 level. A multiple regression analysis showed that the variables in the model explained 86% of the variability. Respiratory/sleep disturbances appear to be modulators superimposed on blood glucose levels determined by other factors.
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