Hypersomnia Health Article

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Illustrations
A colored positron emission tomography ...
A colored positron emission tomography (PET) scan of the human brain during deep, non-REM sleep; the brain is active but not as active as during REM sleep. Active areas are red and yellow, inactive areas are blue. (? Hank Morgan/Science Source/Photo Researchers, Inc. Reproduced by permission.)

A colored positron emission tomography ...

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