Obesity, depression found to be root causes of daytime sleepiness

Obesity, depression found to be root causes of daytime sleepiness: Three new studies conclude that obesity and depression are the main culprits making Americans excessively sleepy while awake. Researchers examined a random population sample of 1,741 adults and determined that obesity and emotional stress are the main causes of an "epidemic" of sleepiness and fatigue plaguing the country. Insufficient sleep and obstructive sleep apnea also play a role; both have been linked to high blood pressure, heart disease, stroke, depression, diabetes, obesity and accidents.