Increased weight tied to daytime sleepiness

Medical providers and researchers have long known that there is a relationship between obesity and sleep apnea and that sleep apnea causes daytime sleepiness or drowsiness.  This finding is now known to be due with increased floppiness of the airway and thickness of the tissue on the chest and airways.  The fact is that daytime somnolence cannot always be explained by obstructive sleep apnea.  This fact would make one think that weight gain may be associated with day time sleepiness with or without obstructive sleep apnea, but the evidence was lacking.