Obesity has epidemic proportions in Western societies and, because of its significant association with morbidity and mortality, is a major public health issue. Excessive daytime sleepiness (EDS) and fatigue (tiredness without increased sleep propensity)--which have been associated with obesity--have a significant impact on individual well-being and public safety.

Specifically, it appears that obesity is associated with objective and subjective daytime sleepiness compared to normal-weight controls regardless of sleep apnea and sleep loss. Indeed, obese patients without sleep apnea are sleepier compared to nonobese controls whereas within the morbidly obese, those who have high sleep efficiency at night are sleepier than those who have low sleep efficiency.

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