Sleepiness May Not Be Caused by Lack of Sleep

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By Molly Grady

If you're sleepy during the day, don't blame a lack of sleep.

Three new Penn State studies say the main causes are obesity and depression.

Researchers followed about two thousand people and found weight gain was the strongest predictor, emotional stress was next.

Sleepiness has been connected to on-the-job accidents and significant health risks.
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