Theodore Friedman, MD, PhD, chair of medicine and chief of division of endocrinology, molecular medicine and metabolism, Charles R. Drew University of Medicine and Science, Los Angeles.

National Sleep Foundation: “How Much Sleep Do We Really Need?”

Lisa Shives, MD, director, Sleep Medicine Center, University of California at San Diego School of Medicine.

American Society of Hematology: “Anemia.”

American Thyroid Association: “Thyroid Information.”

Fritschi, C. Journal of Psychosomatic Research, 2011.

University of Maryland Medical Center: “Diabetes.”

Margaret Wehrenberg, PsyD, clinical psychologist, Naperville, IL.

National Heart, Lung, and Blood Institute: “What are Signs and Symptoms of Heart Disease?”

National Institute on Aging: “Menopause: Time for a Change.”

NHS: “10 medical reasons for feeling tired.”

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