Getting plenty of sleep but still exhausted? Before you blame your multi-tasking, super-woman lifestyle, learn more about what might be at the root of your unexplained fatigue.

We are in the midst of a global energy crisis but it has nothing to do with oil. The problem is unexplained fatigue.

"The single biggest complaint I hear from my patients, day in and day out, is fatigue," says cardiologist Nieca Goldberg, MD, Director of the NYU Medical Center Women's Heart Program and associate professor at the NYU School of Medicine.

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