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How many hours of sleep do we need? Dr. Nancy Snyderman weighs in

Dr. Nancy Snyderman, NBC News’ chief medical editor, joins TODAY to discuss new research that says we may not need eight hours of sleep to maintain a healthy lifestyle.
By TODAY

Dr. Nancy Snyderman, NBC News’ chief medical editor, joins TODAY to discuss new research that says we may not need eight hours of sleep to maintain a healthy lifestyle.